I didn't even read more than one sentence before I saw an issue with your setup.

The GT 2.0 is fine on 1S, I do NOT run the LiPo cutoff because of the low voltage.

As for the radio/esc calibration I calibrated mine BEFORE wiring up the booster. So I set mine up like another 12th/TC/Off Road.

After the radio calibration I wired up my booster and run as per the booster instructions.

If you already have the booster wired up just turn on the esc, NOT the booster for your radio calibration. After calibration then you'll use the booster.

If your using the receiver pack, replace the word "Booster" and put in "receiver pack" lol

As for wiring the receiver pack i have never seen someone run a switch on one. They just wire it directly to the batt plug on their receiver