The 1-2 shift issue has nothing to do with this issue at all, the 1-2 shift issue is because of loss of traction between those gears the vehicle senses slippage and will not allow itself to shift for safety reasons, turning traction control off and adding about a pint of trans fluid fixes this issue, i have tested this on my own vehicle and have never experienced this problem with the v11 93 oct tune. The only other way to prevent this issue is for us to pull power out and make the car slower so that it does not lose traction but normally people who are having this issue are leaving traction control on