Well personally Mark, I prefer the aggressive grind to the 6505 smoothness, cuz at least it has some freakin' character, but either way, it's time you move up to a full-size head regardless!
the XXL is full size but ive always GASed after a 5150 or 6505, even a MESA RECTO on occasion, but ive never been able to afford the recto, and its never suited my style of playing either