If you want to try something g different get ahold of Forestrt ( he is a sponser) hardwood shafts. I have some hard rock maple that are indestructible! He can hook you up with some moderate spined 5/16th hardwood shafts that weigh well over 500 grains. Great guy to deal with. I got some Red Balue (sp?) shafts spined 60# that weigh in the 580 grain range last week. He tapered the tips to 11/32 for a couple of inches, almost like a hammer head except for wood.
Also a great guy to deal with.