Quick spins are very heavy vanes and you are going to end up with about a 26 inch arrow. The shorter the arrow the heavier the tip needs to be to get proper FOC because the two ends are getting closer together. Especially with vanes as heavy as the quick spins.

The 400 axis arrows will spine out perfectly with a 125 grain head which is definetly what I would choose. You wouldn't need to step up to a 340 spine until you get close to 78 pounds of draw weight with a 26" arrow.

A 125 grain head will give you about 12% FOC and the 100 grain head will give you about 9.5% FOC.