Definitely the fana should not be exclusively a counter-champ cav unit nor be stripped of its cav damage multiplier. Reduction of unit stats will suffice. HP and or a little speed and maybe one more armor value.
Speed nerf for cav would be great. People are trying to play 7v7s right now and its definitely even more clear that the speed of cav could be nerfed substantially and the mobility advantage would still be enough.
Not 100% true. We add pop bonus to ssystion before it was added into base game. We also used ram garrison to add speed/acceleration to rams before it made it into base game.