I hope you will still weigh in. 233 Formula Interceptor, Just finished new gauges, Garmin GPS. I checked Drive Ratio 1.47 SEI Replacement. Lastest run on 10-9-20 WOT 3650 RPM 55 MPH weight 5100 est ran 42 MPH at 2800 RPM. Trimmed out Tabs and Drives. Props are 15.3 x 19P Don't understand why I am not turning higher RPMs, Speed Max is prop low 62/65. What next?