Im shooting 71.4 lbs, and its the arrow spec'd on victory's chart. My dealer is on the bowtech advisory staff, so I don't think he's an idiot either.
Manufacturers arrow charts mean
very little. An arrow that is spined properly for a Parker EZ draw (290IBO) are not going to spine properly for a Bowtech destroyer 350 that has an IBO rating 60fps higher..... at the same draw length, draw weight and arrow length..
Look, advisory staff or not he sold you arrows that are under spined for of 71#, 29", Destroyer 350. You should be shooting an arrow with a .300 spine. Assuming a 28" arrow. If you cut your arrows or draw length to about 26" then the .350 spined arrows will be fine.
Plus they fly great with field points, just as accurate as my last 2 bows, right out of the box.
Not to sound harsh but... who cares? Are you hunting deer with field points?
How should I check the alignment on the BH?
With an arrow spinner. You can make one or buy one.