My 1990 120hp evinrude looper is on a 18 foot Javelin. I am having a problem about 50 percent of the time when trying to get it out of the hole. The motor runs good on top end, 56mph, idles great. but half the time when I give it the gas it like it bogs down and won't hardly get out of the hole and the ther half the time it jumps right up? I have a 22 pitch raker prop. I even tried some hydrofoils with same results. Any ideas?