Those numbers sound about right to me. 2.1 on street tires is not unreasonable at all. The difference between 14 and 13.6 could be weather and/or track conditions, etc.
Reaction time has nothing to do with ET. RT is the time that lapses between the time the light turns green and your tires cross the starting line. You can sit at the line for 3 days and your ET would change. ET is the time from when you cross the start line to crossing the finish line.