You got some good arrows that aint cheap for that weight range. That right there is a great start. Dont let anyone cut them down until your sure what broadhead your gonna use. Then start your tuning process. When you decide what lenght shoots good with your heads, only cut a few. Then keep shooting to comfirm your choice of lenght was right, before cutting the others. Too long can be fixed, to short then it's money, and time down the tubes.
A real sharp Zwickey like this one here in the link I provided should put you pretty much in a good weight range for that bow. Only thing is, with this head you would do best to match the bevel with the same wing as your feathers. Rt head with rt feathers, and so on.
Thats just my thoughts.
If you should go with these heads please feel free to aks me, or others here how to sharpen them. It took me a while, but I got it figured now. It's no big deal. I just started using them last year, but never got a shot out of my stand. My son had two good size deer hanging in a tree, so I figured I'd test em out. Three behind the shoulder shots at fifteen yards drawing 50#. Three complete pass throughs with a good sized wound channel. Again these are only my thoughts.
Heres the link.
http://www.3riversarchery.com/Broadh...X_product.html