The only way you could be shooting too much is if fatigue had your shooting form in knots and you couldn't hit the target by the end of the session. If you shot a field archery round, 60 to 100 arrows wouldn't get you through the course. It takes 112 arrows for a full 28 target round. Nothing like those namby pamby girlyboy 3D shooters who can only manage 30-40 arrows a day. [8D]

If you selected arrows that are right on the verge of being underspined for your bow, they will begin showing spine issues very quickly. My opinion is, if you're within 5 pounds of the maximum spine range for one size arrow, it's best to go to the next size up. I haven't looked at the chart to see if that's what's going on with your setup. I know PABowhnter had some issues with the Blackhawk Vapors. Maybe he can chime in with his experiences.

Frankly, if I were going to spend $90 on arrows, I'd throw another 20 spot on the pile and go with ACC's instead.