All of these aluminum/carbon hybrids are quite durable. You probably want the 3-49 (.390 deflection)series for a bow in the mid 60's toupper 60lb.draw weight range, with the shorter 27.5" length. They are rated at 8.8 gpi. - just a tad lighter than the ST Axis.

For a little longer arrow at 70 lbs, or with a 125 grain head, I would go up to the 3-60 (.340 deflection)which is supposed to weigh 9.5 gpi. Finished arrow weight with a 100 gr. head is going to be a little under 400 grains with the 3-49 and a little over with the 3-60. These shafts are really smooth and straight.