Loaded it up in OXCE 7.15.0 and XCF 3.5.1, can't reproduce the issue either.
I take it that 3.6 is a typo since that is not the latest version officially released for XCF.
At this point, I can only suggest you make a copy of the ironman file and start testing by disabling other mods one by one, load the save at each removal and see if the aim 'fixes' itself. Just remember to re-enable all the disabled mods when you want to continue playing.