Problem with Pattern on organic model

Hello,

i've got a problem with my mermaid I did for a school project. For that I made a fishscale texture in Substance Designer to use it on the mermaids tail. I imported it and set the projection mode to tri planar to encounter those weird seams I dont know how to efficently fix:

Its getting worse the more you move down. My teachers told me to try to fix it with the clone tool but I dondt know where to start and make it look nice and even. 

When doing UV-Projection it gets worse:

This has to be possible to fix in some way. 

Thanks for the help.