I'm not sure I understand what your problem is, but could it be related to the degrees of rotation settings for your TS PC with GPL? To match the visible steering wheel in game 1:1 you need to set your wheel to 270 degrees of rotation. If you don't like driving with only 270 degrees of rotation it might be better to turn 'Driver arms' off in GPL so you don't see any wheel at all. 540 degrees with a 9:1 steering ratio is said to be the most accurate to real life. (I use 450 degrees because that works better with my square F1 rim.) Also make sure the steering input slider in GPL is fully set to 'linear'.
I don't know if that helps you solve the issue.
Edited by Millennium, Jul 09 2019 - 02:17 PM.