I actually never even thought of doing this, maybe I'll give it a go and see how it looks.
Tyeguy very curious as to how you tested and what the results look liked that seems wild to me but anything is possible and I'd be interested to hear about it
What is her max range of shooting? I don't think I'd worry about third axis too much if you are keeping shots 30 and under, not sure of the exact effect but my wife shoots similar measurements out to 45 without a third axis and has no trouble shooting 3D on inclines and declines
I think you'll find a lot of guys on here that will say if your bow is in tune then any fixed broadheads flies well out to 60-80 before you see drag take a noticable effect. I've heard great things about iron wills and I personally shoot slick trick standards out 80 plus with my field points. If...
I second Zacs response about tuning to center shot and timing (Although I like tuning timing to how I like it not how the shop says it should be).
Another question, what type of bow do you have? If it's a bowtech don't go playing with the rest it should stay at centershot at least...
I agree with everyone else above if you are going to drop it drop it to 60 I don't think you'd notice much of a difference (strength wise) when going from 68.5 to 65. My normal hunting bow is 67.5 but my backup is 60 and I've got to say when I shoot it it makes me think I should just go to 60.