When we see this we realise this is still the limitation of both AC engine and Shaders Patch that tyreFX does not take effect until the car is ready to go, because the tyre changing when making a pitstop, is only a built-in animation.According to the latest FormulaHybrid2019.ini C1 is white, C2 is yellow and C3 C4 C5 are red. When making a pitstop and changing C3 tyres, yellow ones are fitted to be suddenly changed to red again upon driving off. Bug?
After all you can ask the patch author if he is also able to add this feature. I am just providing configs and textures anyway thus cannot help you