I would agree that the SVK and EMR need RoF buffs. The SVK is so slow that even a blind deaf and ... can realize they're being shot and find cover before you're even allowed to deal damage again. The EMR is close behind that with people generally getting to cover before you can land the killing shot.
The SVD and LMR I'm not as sure about. I would probably agree the LMR just because that would help it in close range, which is exactly somewhere the LMR should feel strong in. The SVD I feel is the only DMR that is in a good place, so I'm not sure it needs a change. Maybe if the others get a buff it would feel weak, but it's hard to say without experiencing it.
I think they are struggling on long range balance with the removal of real suppression. Without real suppression, it will always feel insanely imbalanced when engaging a sniper, because even if you're hitting them in the face with bullets they can just "nope" and dome you.