Wow, really ambitious mod here!

About the UFOExtender accuracy setting: Ok that completely explains everything. I don't use the option so I can not give feedback there. Fwiw, I am working on a new mod (when not playing OXC, so it will take a long time), it will make the game more difficult and "bare-bone", my plans are e.g. to remove HWPs completely, replace laser weapons with weaker Magneto weapons, remove the flying suits no ability to use alien weapons and and and. The main idea is to focus on infantry tactics without any advanced weaponry. Its your groundtroops and the aliens, nothing else.

Inspiration cam from the Kiryu-Kai, an old local/national/japanese anti-alien force with very limited(but elite) funds and equpiment, they were mentioned in the X-Com timeline docs.
I already made the first raw pictures/icons/sounds for the weapons, but I still have to make the handobjects, which is something I really have diifficulties with, so a release is FAAAAAAAR away

It will be (compared to other mods) a rather stripped-down and clear gameplay, but I became so overwhelmed by all the good weapon mods outthere, that I wanted something more simple. That and I have to find a way to keep the workload managable...