Does a heavier weight fixed blade broadhead help with accuracy
It sure don't hurt anything. I guess I'd rather have a tad more weight on the end of my arrow then not enough. Like Bob said though, you need the right arrow setup as well.
will a three blade plane more than a two blade?
I believe some 3 blades do for people. You seem to hear It more with a 3 blade then you do with a 2 blade. I know with my setup that If I'm practicing farther then 35 yards my arrows will plain once In a while on me. I shoot a 3 blade Snuffer.