To me a little longer arrow is better. I shoot a 22" arrow on a Foxfire 2 crossbow. Yeah I know it'sn older bow but it's right on the money at 35 yards inside a 2" circle so Ican't give it up with it shooting that good. I think a little longer arrow flys more true also. Exspecailly witha 150lbs pull. I would think a 17" arrow would be all over the place.

Just MO is all.