Woa hold on there, German win rates in GCS are bloated because they were facing the clearly weak USF and underpowered UKF. OST/SOV/OKW matchup seems basically balanced at first glance so I don't think the Soviets really need drastic changes such as lower tech costs.
Soviets even had a 56% WR against OST, actually.
i know... i generally dont want soviet buffs unless it involves their non meta builds like T4... the SU-76 and the maxim... which means i dont want sov to perform better i just want their gameplay to be less monotonous... #penalspam2T-70 or T-34 without any other strategy possible is a bit boring...
regardless i recognize that UKF and USF are the ones in real needs of buffs... id rather have 3 playable factions even with SOV being monotonous than 1 superfun faction and 2 useless ones... soo by all means buff UKF and USF first... before anything else please put those 2 factions on par with the rest... but if doable SOV T2 and T4 teching needs a look see aswell... that ways winning can be done in ways other than penal/m3 abuse into T-70/34