David,It' s tough to give any advice not knowing what your set-up is.Both the Shockwaves and the G5' s are good heads,but we need more info!!...Heres an example,my bow set-up...Mathews LX,30in.66lbs,Beman Carbon-Hunter 380' [email protected]. Shockwaves,413grs.arrow weight,MZE rest,275fps,70lbs KE.You see,you need a certain amount of KE to operate the Shockwaves,less for the G5' s...Bob