353 setup question
 

Anyone on here had experience with a 353 with stellings boxes and shorty's? These boxes raise the drives 2 inches and with the shorty's drives are very high. Having trouble finding the right prop and the boat does not handle we'll leans side to side when cruising. Any input appreciated. Have 380 tabs on also. Could turn 28 b1 4 blades to 5000 rpm only 70 mph tho. Boat came with 29 pitch p5 hydros labbed to 28 could only turn to 4700 but boat went 78 mph. Seems like May need 27 pitch 5 blades? Seems like boat needs 5 blades because drives so high. Anyone had a similar set up? Motors are hp500 bored to 509 Gil exh etc nothing crazy