ORIGINAL: KodiakArcher
XX78's are a great arrow if they're spined right for your bow, which those weren't. If you get them in the 2315's or 2512's you'd be set but going from a 2315 to a 2312 isn't even close to "similar". You need to re-evaluate your relationship with that shop.
No doubt. you should be mad over this. Thats a difference in spine going from .340 to .420".