The soviet sniper iirc already is balanced around 4 man squads. If i recall it shoots 4 4 shots slower than the ost sniper shoots 6. I think the OP has things wrong, the ost sniper is all about bleed while the soviet sniper should be about countering the OST sniper.
Is it possible to reduce the range or something of the soviet sniper perhaps if the spotter gets killed to help reinforce ambushing the ost sniper vs trying to duel?
It might be slower but the bleed on 4 man squads is much more meaningful as you have to retreat when at 2. What would work is if the ost sniper would kill the sniper man/woman every time so it cant be countersniped back but leaving the spotter time to retreat so the Soviet sniper could be soft countered in this way. Not sure if this is technically possible.
I really struggle with soviet snipers - using a 222 normally meets a mine or skirts too close to the snipers big brother - the penal squad with sticky satchels. G43's are probably the most reliable counter Ost has at least and even then you need 2+ gren squads as most players using twin snipers.