RE: OVER-Spined?
Slightly overspined is ok, and with a dropaway even more overspined is probably ok. The spine lets the arrow bend slightly to help clear the rest. To much bend (underspined) and it doesn't recover, not enough bend (over spined) and it sort of "bounces" along the rest.
You can always "weaken" an overspined arrow by shooting a heavier BH as well. this also ups FOC which also helps accuracy. Can't really make the same move to stiffen an arrow.