Given those numbers I would be very leary of dropping point weight.You are already low on foc and I would probably go with heavier if the dynamic spine would still be ok.

I crunched a few numbers and the 100's are right at 7% foc.This is assuming you have 4" vanes.Feathers would help dramatically.
The 85's would be down around 5 1/2% foc.
125's would be around 9 1/2% foc.


Featherswill increaseyour foc by 2%.


It is reccomended to be between 10%-15% foc for hunting.If you have high ke levels you may be able to go below these parameters a little but I don't reccomend dropping too far below.