I played around some today and she likes an 8" brace, almost 3/4 high nock. I'm shooting off the original brush rest, 3 under. I'm surprised my .500 spine 125gr tip arrows bareshaft well and really thought I'd need around a .400 spine. There is a teflon "plunger" that you can adjust the center shot with although it is not spring loaded. Putting the .500's well away from centershot must be the reason they shoot so well. They come in at 8.9grs per pound. I'll try some .400's and will probably have to turn in the "plunger" some. Fun stuff!