TA31-G-ACSS here. I love the thing. The FOV is huge through the scope. The ACSS reticle is great, it's fast and it's also precise. It is small, but I have worse eyes than just about anyone and I can still see it just fine. The weight of the scope is another great thing too. It's smallish and light so you don't feel like you have a tree growing out of the top of your upper. I haven't handled the other two ACOGS you mentioned, but honestly being that the eye-relief thing doesn't bother me at all, I'm not even interested. That really seems to be all people complain about with the TA31. Plus, you can still keep your head a little further back and still see a nice target picture, you just get blurring around the edge and a narrower field of view.
BAC works, but I threw an RM06 on top and now I can see everything. The way I use it is that I look through the scope with my right eye like normal, then when I transition to a target indie of 50 years, I will tilt the rifle like someone with a 45 degree offset RMR would, except I'm tilting the RMR in front of my left eye. I keep both eyes open and the bright 3.25 MOA dot is fast. I can pick it up immediately.
IMO, this is the perfect set up.