Thanks for the response.
It's definitely working, there's a marked difference in the AI behaviour, and they also remove their NVGs during the daytime. I don't have ACE installed, but the fall on hit feature still isn't working for me. The only other mods I have apart from texture mods, sound mods, and the full RHS pack are ones to remove stamina, reduce weapon sway, and enable accessing the virtual arsenal in any SP campaign. Could any of those be interfering with the fall on hit function?