RE: Broadhead weight question
I like a heavier arrow, especially with a lighter set-up. However, you will need to choose by what flys best if you use those arrows. If you are getting good flight with 100 grain field points, then most likely you will get good flight with 100 grain broadheads.
Depending on how close to borderline you are with your tuning, and how forgiving your bow is, 100 gr. and 125 gr. may both fly just fine.
Chad