and we can have CPE use his mainframe to calculate my shift times from the video,
Would be a very poor method. The fps of the video would not provide a high enough time resolution. However, if you had a Pbox like me you could know your shift times to the 1/100th of a second.
then apply a factor to carve out and downgrade the results further..
If you don't want to correct for DA than next time run the stock box in the morning and the JLT at the hottest part of the day...