hi pt woody, i like it. a couple of things imho. thats a hard board, but get it right on that and you'll ride anything
also keep your feet at no more than your hips apart. i wont go into it why, but you'll go better. in the surfing stance, still keep your hips square to the board ie keep your d### pointed to the nose

this will give you better control.next don't let your bottom hand go anywhere past the front of your hips. you are paddling to far behind your self and at speed it is dragging you off balance hence the dunkings. last, even thou you are paddling, keep the upper body relaxed. if you get two tents up top, your whole body becomes an unyielding unit, that's sorta why you are have to jump off when you come unstuck
but hey, you are having a red hot go and having fun.

won't take too long mate
cheers