Topic on Talk:Mass Effect Legendary Edition
The coalesced edit I use for ME1 definitely improved mouse aiming to a more reasonable level but it may also be the case that there was some other mouse aiming issue that only affects certain systems because just turning off mouse dampening in the gamersettings.ini did nothing for me for both ME2 and 3.
This was a very specific wild jump in mouse aim speed but I couldn't say what the definitive cause of it was. I just know that my edits in the coalesced fixed it.