Hi Ronald,
I think you didn’t well understand my issue. In After Effects, I’ve already made Optical compensation (and stabilization) on my clip, before tracking it in mocha.
What you can see in the frame before attached is really a curved billboard (in Piccadilly Circus, London) and it is not a optical distortion!
Therefore I tracked it normally but than I applied Insert Tool / Warp to distort this corner pin to match the real curved shape of the billboard. And I made it but I don’t know how to export rightly this curved corner pin in AE.
Anyway, to be clearer, I attach an other photo to explain you what I mean:

So, in this case as well, if you want to add a billboard to these curved balconies, you have to create e curved corner pin…
I hope to have been clear now.
Bye and many thanks!