I understand biker, I tore both of my rotator cuffs years ago, and the max I can draw comfortable after a day of treking the mountains is low 60#. I shoot a mathews as well, and with a 62# bow and muzzy 125 grains, I dead centered a rib on the way in and on the way out of a 12-1300 pound bull moose this year. The broadhead was sticking out about 8" on the other side of the bull. There are very good arguments however on the use of a 2 blade fixed vs. other heads, and they will probably give you a better chance on a bad shot than a 3 blade. On a good placed shot however, the three blade is just as effective, and a 2 blade won' t kill them any deader.
As far as Bob' s idea... I personally hate sharpening knives, so I know I would not enjoy sharpening broadheads. I always feel like I don' t get my knives sharp enough, so I' d rather use a broadhead that I can just replace the blades on, rather than worry about sharpening.