Hover MLRS for the price is very nicely balanced in my opinion. I feel the problem as said above is that nod has zero offensive ability on the water. Getting an aircraft is usually the answer but to Kickmofo's credit, your Hind can be killed by a Hover MLRS from far away by a skilled player or because you're trying to fly across the map to the Hover MLRS and taking hits during flight.
The new Sprout Tank Unit is useless. It's too expensive, too weak, too slow, and I don't think it even has a machine gun. Only other option is the AMX-130 which is... a tank. It's really average in every regard. Not bad, but not specialized or able to do anything on it's own really unless in groups. It can harass units but is usually outranged by said Hover MLRS.
I think it would be best if Nod got some amphibious love as the solution.