In short:
AIM FIX Combat Camera is incompatible with other non-SKSE camera mods.
AIM FIX Lite is compatible with camera mods.
Both editions of AIM FIX mod is incompatible with any mod which dynamically updates crosshair position.

Alternative start mods:
Camera mods:

Combat/balance mods:
HUD/UI mods:

Gameplay mods:
MCM-section called Advanced compatibility contains very advanced options to partially disable AIM FIX functionality at will.

Q: Do I need to manually adjust the crosshair offsets for archery/magic if I already getting nice accuracy?
A: No, until you disable Skyrim's auto-aim assist feature.

Q: Do I need to disable Skyrim's auto-aim assist feature?
A: To make a decision please read an "interesting article" you missed at the beginning of documentation.

Understanding the game engine issue with the crosshair:
The hit point offset is a deviation of an actual hit point from the crosshair when shooting the arrow or casting a spell at the target. Hit point offsets is appearing differently for each character position (standing, crouching, on horseback), type of attack (bow, crossbow, spell, staff), meanwhile all of them are acting differently for each camera view. These deviations is being caused mostly by animation and skeleton mods. Also the 1st person SKSE-camera mods, such as IFPV or Enhanced Camera is always causing these deviations to be more noticable. But mostly the hit point offsets are noticeable when you disable the auto-aim feature of the game. Thus when player is disabling the auto-aim for realistic ranged combat he always getting a broken crosshair as unpleasant "bonus" but this how the game engine works. Many even disabling the crosshair because of that but disabling the crosshair will not fix a crazy projectiles which sometime is hitting completely different sides, for example when you shoot the same static target standing on foot and then from crouching position.
Since these hit point offsets are always different for everyone (because mod sets are differnt) and can not be fixed, the AIM FIX mod provides a workaround - the aiming offsets for archery and magic to compensate a deviation of the hit point by moving the crosshair to right specific hit point.

The aiming offset represents an additional number which will be added up to coordinates of the crosshair, in relative units. AIM FIX will apply user-defined offsets automatically in background as soon as any combination of player actions will be active. Please watch the tutorial movie (available below the documentation section).

Adjusting the aiming offsets:
1. First do set up all MCM settings at your personal taste (FOV, camera, Auto-aim, and so on). Only after all MCM settings was set you can start adjusting the archery/magic offsets.
2. You need to prepare shooting range in game for practicing/calibrating:
- choose a static target in game to shoot at practice dummy;
- choose at which distance your border will be from a target (around 10 actual character steps is recommended).
Important note on game engine limitation WITHOUT AUTO-AIM:3. Make your character to stand in front of the target at chosen border distance and equip weapon or magic for whom you want to calibrate the crosshair.
4. Aim the crosshair at the center of a target, shoot and see how far the projectile will be from the crosshair when it will hit a target. Just visually remember this distance and side (to the left or right, higher or lower).
Note that you need to always keep up two conditions: standing at constant distance from a target and always aim in the center of a target.
5. To understand how much you need to adjust the crosshair in relative units:
- first aim the crosshair at the center of a target and don't break the constant distance;
- go into AIM FIX MCM-section "Aiming Offsets: ..." and first try to increase the X-Offset value for your current character position, camera and type of attack.
For example, if you crouching with the bow equipped in 1st person camera view then adjust the Bow Sneak X-Offset under the "1st Person Archery Offsets" header. Don't know on how much? Just increase it at +30 and see where the crosshair will after you exit MCM. You will handle the rest easily, just practice a bit and you will feel where the crosshair goes. By the way, don't forget to read hints appearing below when hovering on MCM options. They contain detailed info on direction when changing values.

The main goal is to get the crosshairs to move to the last hit point. However, you should always aim at the center of the target and DO NOT move before and after the MCM.

Thus you will need to adjust the aiming offsets for:
- character position (stand, crouching, on horseback);
- type of attack (bow, crossbow, spell, staff);
- camera view (1st/3rd person).
Note: you don't need to adjust the offsets for actions or camera view you don't use, for example: not using 1st person camera to shoot? No need to adjust it.

REMEMBER: If you change FOV or camera position AFTER adjusting the offsets then you will have to redo everything from scratch.
Repeat the offsets correction when:
- changed ranged camera settings, FOV or vanity distance (min and max zoon);
- toggled the Auto-aim assist for archery or magic;
- the crosshair goes crazy again after another new mod you activated after offsets where adjusted.

Q: I am playing only in 1st person view. Is mod functions for 3rd preson will affect the performance? Because I don't need them.
A: 3rd person functionality is inhibited during 1st person and vise versa.