Soldato
The trouble Merc have is that, this doesnt seem to be a massive problem across the board. The Red Bull doesnt seem to suffer from it to anywhere near the extent that the Merc does.
The FIA will likely just say "design a better car then. If Red Bull can do it, so can you".
Hamilton's onboard during practive did look utterly ridiculous/horrible, but i can't see them changing the rules for Merc, just because they designed a **** car.
They all have it just to different degrees. The Ferrari for example looks horrendous, even the McLaren which is one of the best has porpoising.