Next time I buy arrows I'll go with the 400 spine. I had no idea of the importance of stiffness.
This is where the box store usually fails, the clerk/staff knows enough to sell you arrows, but not enough to sell you the right ones for your set-up.
If you discussed your set-up with the store staff - draw length, draw weight, arrow length, and tip weight - they failed if they recommended those arrows to you.
Don't feel bad, we've all been there a one time or another.
But - that is why many of us will recommend going to an archery pro shop - where they do nothing but archery.
I get that the local shop may not be a good fit for you based on attitude, we have one locally that has a similar problem, I've driven miles to to get the service that I felt I had paid for.
