boat losing power out of the hole.

Lately my 07 star is been having a REALLY hard time getting on plane. Engines not screaming or struggling it just takes a couple of minutes to get on plane. Im was gonna just take it in to have them look at it but i thought i would see if anyone could help me find the problem on here. I have turned of PP and there are not anymore people than usual in the boat and, the prop isn't bent. The engine starts and idles fine, and doesn't bog out. Once it gets on plane its fine. The engine is the 6.0 Captain Crusader.