Our local county highway district will come out and recalibrate a light. Just give them a call and within a couple of days they will send someone with a bicycle to tune the sensor.
We also have a law on the books that allows a bicycle to treat a stop sign as a yield and a red light like a stop sign. Sometimes traffic is heavy enough that you really need to trigger the light.
+1 on putting your wheels/frame near the edge of the loop