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I just got my Z7 :shade: but since I have noticed that several of my arrows have been splitting at the nock end. These were some of my older arrows but should be the correct spine. I am shooting at 60# and the arrow is 28-3/4" from valley to end of shaft. My draw length is 29". The arrows are carbon express predator 4560's. I am also shooting some Gold Tip 5570's that have not had any problems but are only a couple months old.

I think I am on the cusp of spine recommendations, my question is would I be better served to move up to a 350 spine?
I may well crank up my bow draw weight to 65# anyway.
 

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AT 70 lb, you need .300 spine and at 60 lb., .340 spine. The newer more aggressive cams need a stiffer spine, especially for broadheads.
 
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