Iam shooting a hoyt zr 200 with a 30 inch draw length at 60 -65 pounds.recentley got new arrows, Beman 340 ics bow hunters..27 1/4 in length with 100 grain points and blazer vanes.. at first they shot great now iam seeing a porpoising kick just before impact, the thing is it doesnt happen all the time with any given arrow. I am kinda thinking it's more frequent on breezy days ... ideas on correcting this maybe too much spine? Maybe its me? Maybe I should get a new login name..any ideas let me know...thanks