With it being heavier you're going to lose speed but you're going to gain more kinetic energy.. if I'm not mistaken I'm sure someone will be able to elaborate more on this subject, or correct me if I'm wrong.

I'm shooting 75# @ appx 286fps
gold tip hunter pro 7595 @ 10.1 g/in
arrow + broadhead/field point = 406
and with the nifty little calculator for kinetic energy I found I'm around 73 ft lbs of energy.

I shoot 100g as well, not sure what grain your arrow is, or what I would be shooting fps wise with 125 grain.