Shallow Sport 18 hole shot help

I have a 2008 18' SS sport with a 08 115 etec w/4 blade Rogue prop and Cav plate. The boat floats in around 6-8" of water but will not get up in less than 14". Is this common? The boat will start out on the hole shot and just fall off. I feel like it is blowing out. I am new to this boat and would love to hear some advice.



Could it be a prop issue? The current prop has no cup the blades actually almost fold out instead of in (Cup)



WOT it runs about 5600 rpm-35mph which seems low to me.



I would rather have hole shot than speed.



Thanks in advance for the help