Bud,
I have an 81 pound hill style and also draw 27 inches...here is what I did...
I built out the strike plate just a little with a piece of leather, then got some 80-85 surewoods.
I jumped up one spine group, then put on a 200 grain Ace broadhead....the finished arrows weigh just under 80 grains...probly right at 770 or so...
And its a readily available spine...in a super tuff shaft that never needs straightening, at least not in the short 3 years that I've been shooting them.
I also took some and soaked them in Danish oil in 3 inch pvc tubes for 5 days. They took 10 days to dry, hung up by clothes pins in my garage. They gained about 80 grains of weight. Those finished arrows weigh a good 850 grains and they hit like a 300 win mag......
Good luck!