the reason I was asking how many Mah you are putting back into the 3000mah 3s battery is if you take them down to far on volts they can puff..
the video looks like it is doing low 20s
check to see how your rudders are set, make sure they are not towed in or out, better yet take the left one off
also check the trim tabs and see if they are at 0*
next check you turn fins and see if they are straight
and check your strut, I know mine is angled down and that causes the boat to want to plant the nose down.. I need to move it to 0*
I hope this helps you out.. [:-]

I'm going to try a Trinity P2K pro motor this weekend with the stock prop and see how that goes on 2s