I have a center console 961 Blackhawk with a 115 Pro-xs and CT gearbox. Prop is 21p vengeance and is mounted to an Atlas 6 hyd. jackplate. The motor is mounted one hole down on the bracket with lower unit setting with the cavitation plate at bottom of the hull. I am going to measure just to make sure. It just seems if I come up on the jack plate at all she blows out. The boat seems to handle good and turns really well. I am looking for and tips and tricks for set up on motor and the transducers. Seem to be getting a lot of wash on the screen. How fast is normal before the readout is not reliable