T4: An extended T1/T2 play with a sniper pgrens (shrecks later on) halftrack and 2 pak40 into a brummbar. Brummbar is very effective at clearing atguns (use attackground!) and can take more hits than a p4. It's 40 range means you have to back up early on but you should be able to clear 1 atgun at the time. German sniper is great agains support weapons and should be easier to keep alive on teamgames, pak40 is the best AT in the game and will make short work of any tank besides isu. A panther next I guess, im not a fan of the panther with it bad accuracy but you will want some mobile AT otherwise artillery will make your life miserable. Panzerwerfer later on if they blob their support weapons hard.
You go Close air support/luftwaffe/ostruppen and stay in t2 forever with fuel conversion into all the strafes/shrecks/stukas you want. This wont really work against players who know what they're doing though

But if you just want to keep playing the way you do now with small tweaks I would suggest mixing ina german sniper. the amount of fire going on in teamgames means there is plenty of cover to stay hidden forever and sov teams wont ever get him