People love to ask questions about this in the shoutbox. How about asking them here, so you can get a clear answer? Then others can benefit from your questions as well.
I just played 2v2 Ranked Random and my playercard updated perfectly about 5 seconds after the end of the game. I really don't understand which stats you think are "frozen."
We don't know exactly how the match maker works. If it is indeed the case that two highly ranked team players start at the base ELO when they play their first provisional 2v2 AT match and get matched up against a bunch of low ranked non-AT players, then the system is not taking advantage of the information that is available to it. It's perfectly understandable that people are upset by the matchmaker creating extreme mismatches.
I couldn't read past the first change of buffing the shit out of Wehr w 5-man gren squads and nerfing the fuck out of Sovs with molotov/ATnade either or.
The lack of global upgrades is a big issue, but using that specific suggestion as your first example just buries the legitimacy of your entire post imo. Perhaps you should start with something a little more popular, like tank smoke or tank traps, which are basic gameplay features of Company of Heroes that have been relegated to bad commander DLC.