pre-cum: depends. sometimes I don't pre much at all.... and sometimes I get a damn pond in my pants. LOL
cum: more - cum is great. I'd like to to be a little more fluid so it shoots better, too.
size: more - an inch in length maybe 1/2 inch or 1 in girth?
curve: My curve is a little left and slightly down... very little of both.... but what bothers me is it kinds twists toward the left, too. grrr. straighten that out.
head size: bigger - by a little. what I really want is for it to inflate nice and fat every time.... sometimes it seems my head's still soft when the shaft is like a rock.
cut (I'm cut... and if being uncut means more sensitivity, then I'm glad I'm cut.... cause I moan like I'm being tortured already... LOL )