I tried both, together and separatly, only the shrink trimmedsfr changed the a bit the surface but it just moved the defaults to other places.
I also try to create the surface in a different way and apply the pattern after, so initially the surface was created with patch, and then i tried with rail revolve. everything is fine until applying the pattern. with rail revolve the default are still there but instead of being orientated like on the picture, they are orrientated along the radius of the rail revolve.
What i don’t understand is that the surface analisysis before the pattern is perfectly fine, but after applying it it is very messy. the pattern is applied with the commend split, so i though it would just cut the surface, but it seems to modify it also.