The Wallace Calculators have an "ideal" calculation which you can base on any part of your time slip. I find it useful to see if there is any portion of the run that could be improved. If you plug in your mph109.33 your ET should be 6.22 and your 60 ft should be 1.37. If you use your 6.32 ET, then your 60 ft is spot on and you are fast, as it says you should go 107.55. I would lean toward the idea that you may have some 60ft left to be found.