So.... if its balanced against high number squads... would not that directly translate to being op vs low number squads....?
And one balanced against low number squads will underperform a bit vs high number squads...
Pretty much. A sniper kills one model per shot. The more important that model, the more pain it inflicts. The more often it can shoot, the more often it inflicts that pain. By the very nature of the unit the Ostheer sniper will be better against UKF and USF than it is against SOV. Were mirror matches a thing the Ostheer sniper would at its most potent against Ostheer itself.
The Soviet sniper is usually shooting 4-man squads or 5-man Volksgrenadiers. The Ostheer sniper is usually shooting 6-man Soviet squads or 5-man UKF and USF squads. Therefore, an identical sniper is inherently more effective the Soviet faction than it is to the Ostheer faction.
That's why the one-man Soviet sniper shoots more slowly than the Ostheer one. Where the exact balance point is I have no idea but it's below 1:1.