I don't know, I've never had any trouble penetrating any AC in the past, but it is happening with the M3 way too frequently. I guess having related bulletins nerfs its penetration.
With the patch going live soon, this issue needs an urgent fix. Otherwise the exploits popularised by the likes of Captain Yolo will alienate the majority of the playerbase.
Customization systems are a critical part of RTS games. You are always sacrificing something for something else. That adds a certain level of decesion making for the players to make.
If you are happy with that %0.0000000000000000000001 bigger penis for your REs then you guys are a minority.