Great question TxRiverRat and you nailed it in your comparison.
The honest truth is the difficulty I had had getting up on the Concept. I bought it after coming across a good deal. I am 6'3", 215 lbs. I was concerned with the size when I bought it as I knew getting up on a 67" was going to be tough. It was one of those situations where you roll the dice and hope it works out.
I could get up, but it was a fight. Toward the end of the day when I was fatigued, it was almost impossible.
Like I stated in my original post, I am not a professional and I don't ski a course. I'm a recreation slalom skier/open water skier who just enjoys a fun ride. While I know I am losing a little going from the Concept to the HP, the added length and width should make it a little easier to get up on.