Did you reduce Ch3 trim to 60<80% or even minimum, alternatively adjusted EPA almost to maximum?
Do this prior to set up of any new ESC for each model as an Optic 6 Sport is similar to all othert computerised Tx, refer:
. EPA, ATV, Dual & Triple Rates, Expo Differences & Caution + ESC / BEC Set Up
Further information is available under:
. Hitec Optic 6 & Optic 6 Sport - Manuals, Tutorial, Comparison Charts, Updates & FAQ
Alan's Hobby, Model & RC FAQ Web Links
I have tried that with no luck. I could not find anything in the links you gave me that helped. Thanks for the help. Really hoping to figure this out.