Thank you for your infos,
Yes the GT is in the middle from the ST and VT series, it share some things from the ST and other from the VT, so it have the 10 points controls for the withe point and gamma and the CMS.
I also use the 10% APL 22% but with 10% step, how you calibrate the double of the steps with half of controls? (5% step->20 points but 10 controls point in the tv).
For me will be very useful to share some other info in the calibration process.