Whoops! Can the above! I just read that it's not cut past centre. In that case, I would put at least a 125 grain steel adaptor up-front, and try maybe a 125 grain broadhead or greater. I would suspect something like that would work, because I shot the same arrow from my 78# @ 29" Black Widow longbow (cut to centre) with 200 grains of broadhead on top of the 100 grain brass insert. So you'd need even more than that up-front, which would give you an arrow up around 750 to 800 grains, with high FOC.