The 06 Binaries have 1/2" modules for draw lenght you can tweek them a bit but noway are you going to get an inch without changing the modules.

If you have an 05 they did not have the module adjustment but the cams came in 1/2" sizes again you wont get an inch out of them maybe a 1/4" but it will effect let off so becareful you could set it to 100% and be in big trouble, the cams will over rotate and lock at full draw, you will need a press to reset them.

As to the draw weight I would not even think about backing a 70lb bow down to 58lb if you want 58lb then get a 60lb bow and take off the 2lbs.

If you already have the bow then just get a set of 60lb limbs for it.