Hi,
I processed your product and try to apply some L1 and Idepix flags before processing with C2RCC. The quality did not improve a lot, but it looks better than your scene above. I attach it here. Idepix or C2RCC do not find invalid pixels related to the stripes, so values should be considered right. But I think you should try to compare with in situ data or other satellite products (maybe Landsat can help?) and see if values make sense. I still do not know how homogenise the scene, maybe it is not possible at all. If I find some approach that is worth to try, I will let you know.
