Well, I suggested some nerfs because knockdown on horse seems a bit OP to me.
You know what could work too but I'm afraid it would become too popular very quickly (cause it's OP).
Long Iron Mace
weapon length: 95
weight: 4.5
difficulty: 14
speed rating: 75
weapon length: 95
thrust damage: 20 blunt
swing damage: 30 blunt
slots: 2
Unbalanced
Knockdown
Crushthrough
Price: ~15000 gold
Also 2H axes on horse make no sense if you ask me. I would balance those a lot differently. Maces and spiky maces were used on horseback, not huge axes. All I know that persians used axes on horse back, never heard any european nation using them.