I smoked the stock ESC on 4s so i decided to install the turnigy 180 ESC, Programmed it got everything to work except one problem, The motor revs high rpm's when its out of the water, Put it in the water hit full throttle and it gets high rpm and cavatates the prop, takes off and as soon as the prop hooks up it takes off like a missile, but only for about 1.5 seconds then it starts going slow, like it only has half throttle and no power, But at the same time its way more power than like if the lipo cutt off hit. it doesnt make sense to me. It kinda drives around like the batteries are almost about to hit the cutoff but i pulled the batteries out and they practically have a full charge!

I have the programming set at:
running mode: forward and backward
lipo cells: 4 cells
low voltage cutoff: 3.2v/cell
timing: 11.25 degrees

Any help would be great thank you...