Are you kidding ?The Romans v pikes is not a big problem. Double minus against average pike is not a huge negative.
Actually at even in impact, if the roman win, the melee combat is favorable to romans, If not and the romans don't lose a level and a base, they may win a melee and reverse the odd. With a double minus, they can't do that and even they won and the pike lose a level, the pike have more probability not to lose.
Please, stop to look at Crecy and Poitiers were longbows cowardly hide behind obstacles or on hill and look at Formigny or Patay where they were caught in open.Knights at evens v longbow is fine.
I agreeArmor may not be perfect, but the current set-up is too integral to the core rules to be changed easily. I would leave things relatively as they are and fix the AP. It may not be perfect but it isn't a useless fix either. If I can get enough protected lancers I can probably wear down your armoured cavalry...