Although I myself am pretty non standard I'm not sure about the cameras. Just the one's the new EZCA imported from the original aircraft? Anyway, I did find cameras.cfg and set clipmode=normal in the camera definitions there and it helped all but the world view camera. I might just try to remove clipmode all together and see what happens. Awesome rendition of KIAH by the way!
Also I have always wanted to use GSX but never had enough luck with FPS. Now with GSX at KIAH or KFLL (both of which I just purchased for P3d v4) I am pushing 50+ fps with I5 6600k and GTX 1070. Full version of GSX is on my list once I get my NGX and Airbus back.
*still getting flicker with EZCA world cam though but no other external cameras flicker once clipmode is set to normal (or deleted)
example here...