I've got a 97 225 Venom on a 96 Bullet (1200 lbs.) 4B 27" renegade prop at 2" below pad with 12" setback. Engine has fresh powerhead and runs great but won't get more than 5200-5400 RPM's. This rig in the past would easily turn 5900-6000 RPM's. Any suggestions of things to check?? Thanks in advance!!