Hi Ivan,
I have been using your camera 360 for two years and you’re still on the cutting edge, congratz 
Anyway, I just tried the v2 and finally managed to get rid of these bad edges when using lumen workflow. However, the 0.5 value you recommend for overscan percentage is way high : it increase the render time by… well, 0.5. Since the edges are about 1 or 2 pixels width a value of 0.05 is enough to get rid of them.
Maybe you already talked about it later but that was the opportunity for me to thank you for your work 
See you,
Mat Mond