had the advent Mecs buff event , seems to be broken (they have over 100% chance to hit and 65% chance to crit on fullcover + smoke + hunkerdown) i disabled EW rolls and still have the bug ( after hacking an advent mec i notice they have +86% aim instead of +15%
after checking the INI i notice that there is a multiplayer of 1.25 aim , isn't it supposed to be 0.25 instead

Have you checked their actual aim stat? I'm fairly certain it's working as intended, though there may be an incompatibility with another mod that leads to these strange values, for example EU Aim Rolls and anything else that overrides the GetHitChance function in X2AbilityToHitCalc_StandardAim. You'd probably have to deactivate those mods and test it in a fresh mission.

i tryed with and without , it's defenitly an icompatibility , but can't know what's the conflicting mod , and yes i'm sure it's the the dark event since it was saying , can give a screen shot if it can help u

Hey Bstar - For your DarkEventAbility_AdvancedMechatronics and DarkEventAbility_AdvancedCombatAI you will need to add an additional check for bIsAdvent. The stat boosts are effecting Xcom turrets! I just played an avenger defense mission and the turrets were receiving an 8% bonus in aim with that AdvancedCombatAI listed under the shot calculation as the reason. I didn't take a screenshot.

Nice catch! Unfortunately, I haven't been modding for a while now, so I'm not sure if I still have the project and everything on my PC, but I'll try to fix that asap.

Thanks you will need to check for bIsAlien for the sectopods and other fun alien robots.