Interesting the variance between chronos and conditions, I guess we never know if our results are correct or not.
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The key to getting good results out of a chrono, like any test device, is having a good, repeatable process and controlling conditions. You can't just start flinging arrows through it an expect that what the LED displays is correct. Since we do not have easily accessible primary standards for speed, the best we can do is to calibrate our procedures to provide repeatable results, shot to shot, and day to day. Testing the capability of the procedure with a compound bow or recurve with a clicker will help since there will be less variation from the archer. In fact, a compound bow could be set up as a calibration check before new measurements are made. I have found that compounds are very consistent, even when shot with fingers. I have learned how to get good numbers out of my chrono and how to identify when the conditions have degraded to the point where the results are no longer valid. I can take the same bow and get the same results day after day, and the results are what I would reasonably expect. That is what we are really interested in. Whether my 203 is really 205 or 201 is less important, as long as my measurements are reasonable and consistent. That means I can compare measurements I have made from bow to bow and feel they are consistent across the population of bows that I have tested. I cannot, however, tell you that my 203 is faster than your 201, nor do I care to. We are not using the same procedure and our chrono's are not recalibrated on a regular cycle, or at all.
