I agree with Jgalar...
You can't have high expectations from a big-box store.
It's likely the "tech" that set up your bow had little-to-no archery background, and was probably pulled from who-knows-where and given one Saturday of "training."
He installed the accessores and didn't ruin anything...that's about all one can hope for from shops like that (most of the time). The fact that everyone wasn't "perfect" shouldn't be a suprise. No amount of levels, measurements, and eyeballing can get it perfect without shooting it.
It turns out the arrow was not square to the bow or string.... It was approximately 1/4" closer to the front of the shelf than the rear....
That would put the tip of a 30" arrow at least 2.5-3" off center!
Should he have noticed that and corrected the problem?
Definitely...I won't argue that! It should have been obvious from even several feet away!
But take some responsibility yourself...that is something you *should* notice the first time you knock an arrow, not something you leave that way and continue shooting for a month. Besides, you only had to turn one allen bolt to resolve the problem.....
Besides, there is always the chance that the rest worked off to the side with each shot. If it wasn't properly tightened, it is very possible. String stretch or a slipping nock point could account for other issues as well.
I should have left the store with bow set up and ready to hit the range and not having to adjust anything but my sites....
I've been shooting for 16 years and that has NEVER been the case.
There are always small adjustments that need to be made to nock points, rest alignment, and even tweaking tiller, cam adjustment, etc...not to mention possible issues with string stretch the first 50-100shots.
To expect that your bow be 100% tuned for you is really reaching out there. As you now know, it takes a lot of time to micro tune your setup to get perfect arrow flight...and if you hand that bow over to someone else, you might find that it doesn't shoot *right* for them like it does for your. Body mechanics and shooting form can make just enough of a difference that you can never have someone else tune your bow.
He installed your accessories, and you got it fine tuned and now it's shooting great.
Enjoy it! Nothing beat a fine tuned, straight shooting bow!