If I remember right the 5575's are 8.9 gpi and with 100 gr tip your total weight would be around 354 gr which comes out to about 5.2 gr. per pound at 68#. Right on the edge as OHbowhntr has mentioned. You could go to a 125 tip for your assurance or go with the 7595. Personally, I like to push it and I would stick with what you have, maybe even crank it down a lb. to get to the 5.0 minimum.