I' m a little surprised too.

Did you measure the draw length or are you just assuming it' s an inch longer? I' ve seen many modular bows that will measure say 28.75" w/ a " 28" mod, and then only be 29.25 w/ a " 29" mod.

Generally you will see about a 3 to 3.5% diff in arrow speed for every inch increment lost or gained in draw length. HOWEVER certain cams and bow designs gain and lose sometimes at very different rates. Solo' s especially. They tend be pretty efficient from abot 29 to 31" of draw, but lose big chunks of performance in shorter draws.