So after several frustrating matches with the T20, I relented and spent 200k for the Enhanced Coil Springs so I can use the exp I'd earned to getting the turret instead and finally mount that 90mm. It's now a more bearable tank now since I can properly deal damage using peek-a-boo tactics instead of dealing piecemeal damage per shot.
Still, quite odd that my best game with it so far exp wise (990 without doubles) was the one match where I only fired 3 shots, with the rest of the exp earned through passive scouting