The solution to many, or most of the problems with OP tanks, is simply DELETE OPHELIA.
If a vehicle is OP, there is nothing that makes it OPer than pairing it with a commander, whose main skill is also grossly, ridiculously OP.
Actually I have an easy fix for this problem:
Every game you play with Ophelia... doesn't count.
That is to say: every win gets you Zero credits, and every game you win or lose using Ophelia does not count toward your "stats".
Because then, everyone who actually just liked playing with Ophelia could do so, and everyone who who plays with Ophelia because they are talentless, stat-exploit vermin, would get nothing out of it.
Obviously, if they had actual talent or skill, it wouldn't matter, and could could easily get the same effect from Sabrina, or Ioannis or whatever.