Worried about prop slip or cavitation on our 23' Proline with a DF 300. We were out last weekend with all working well putting around the lake for a couple hours. Once we started tubing and wakeboarding in the afternoon, after an hour or so the propeller seems like its cavitating or slipping when the motor is under more of a load than just going straight. Happened when pulling up a skier or turning hard to shoot the tube out over the wake. Decided the day of tubing was over and it ran fine back to the launch. We did have 6 on board that day, but nothing pushing the weight limit of the boat. Wondering what's up?