heavy cav has it's uses, but definatly not as versatile as medium cavalry. Since I only use no more tha 3 slots for cavalry, the heaviest thing i usually field are thessalian cavalry, tho usually lonchophoroi or prodromoi. Camapinian cavalry are absolute killers if u use them right.

QS: heavy cav dun really suit your style of play, ur better off with medium cav with shields+cheap light cav with AP/javs... I may be wrong, cuz i'm purely judging from your AARs.