My wife's bow style and draw length is similar to the poster's, but it is 42@28". With 440 grain arrows and drawn to 26&1/4" she get quite a bit more speed than that, if her draw length is 1" shorter there is about an 8 fps drop in arrow speed on average. Encouragement for her to get a full draw. Amazingly, her bow tested out at 28" exactly what is posted on the Stu Miller arrow chart, so at least the chrono we used was either on the same or off the same as the one used on that site. You are drawing a bit less grains per pound that she is, so I am going to guess that something may be off a bit. Perhaps the chrono is giving a consistent slow reading or perhaps you are losing some of your drawing energy due to a shorter draw length than you think or are having a fading release that is robbing you of your drawn power. I have seen lots of cases, including dvds of Howard Hill in super slowmo, where the arrow starts coming considerably forward before the string leaves the finger tips. John Schulz would call it a soft release, apparently even Howard Hill on occasion had a softer release. I caught myself at a 3d shoot with this, on the chrono set up there it made a 15 pfs difference and I was surprised how consistent that soft release was, my real release was probably only 24" before I fixed it.