I'm a lancer and I kill aware 2h people with my lance more often than they kill me or my horse
They think they will outrange me, but lances still have like a picometer more reach, thus 2h usually die trying.
However, horse charge damage and survivability should probably be doubled or tripled at least. Everyone carries xbows that oneshot horses or throwing junk submachine guns these days. That's the real problem besides 2h being hard targets.