I have had this issue as well since the airport came out but never said anything about it.
I'm not using anything except GEX ground textures and FSGS mesh for the area, but the bleeding on my system only happens around the middle of runway 13/31. It's funny also because when I taxi around terminal 3 using taxiway T, T5, and T6, my plane kind of goes up and down like its bumpy there. As soon as i get off that area it's smooth again.
I also have my mesh complexity and mesh resolution slider all the way up but it doens't help.
Can post some screen shots of the bleeding on rwy 13/31 if needed.