I think a 430-450 grain arrow out of that setup would be way too much overkill. I understand wanting to shoot a heavier arrow out of a light dw setup for ke purposes, but there is a point where the gain in ke verus the lost of speed can hurt you.

If I ran the numbers correctly, a 330 grain arrow (typical of an Easton Redline with 125 grain tip) is going to produce around 24lbs of ke, where a 430 grain arrow, out of the same setup is going to only produce 22lbs of ke. The 430 grain arrow will have slightly more momentum, but imho, not enough to make up for the lost in speed (about 30fps) between a 330 grain and 430 grain arrow.

*note*, I did not run these numbers by hand, I cheated and used http://www.backcountrybowhunting.com/articles/tools.php because I am feeling pretty lazy right now.