planing can be brought on by all sorts of demons... nock point being wrong, position of the rest, how your line is attached, gripping/torqueing the bow to hard... start with your grip, that first and fore most causes arrows to plane... keep it loose... after that start working on your nock point... I shoot mine at 3/16th high, yours may differ because of rests, grip, arrows, bow poundage etc... move it 1/16th inch at a time up or down from there and see what happens...

it's not your bow weight, cause I shoot my Black Eagle at 65-70# when I'm into big stuff... make sure your centershot is aligned correctly also... it takes a little time to set one up correctly... when you get it right, your arrow will enter the water with a very minimum of splash and stay on line to your target, providing you've done your part... good luck with it...