I would have agreed with you about the surf style board getting air more easily a couple weeks ago. The Diamond 54 is definitely slipperier(?) but the more time I spend on it and find the right balance, I honestly think it's just a little different riding style. With the surf I would actually get short of breath/dry mouth and kinda tired at the end of a ride from working. I can ride a lot longer on the skim with a lot less physical work if that makes sense.
The hypsta was fast with some more traction underfoot but I would not say it is anything like the race. Still feels like a skim at heart.
I got the Diamond 54 for $540 cause it had a blem on the paint. These are all expensive boards