Let it be as it is, wvdeerhunter22. Just write the actuall length down somewhere and measure it again after some 500 shots. Mark a spot on your cam that tells you if the string stretches out a bit and if you really, really want it exact on the 31,5, you ad some turns on your string and place that cam back in its orginal position. Just dont be alarmed by little differences in brace and ATA lenghts. The bow will do just fine.