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Hi Ludo29200

I agree with IamSam after I looked at the PSD file as well.

I also noticed that your approach using the shapes in the upper clipping position did not actually isolate the effects to the shapes edges if you look carefully

An parallel alternative to what IamSam showed is to just turn the shapes in to Vector masks which preserves the sharp shape edges.   I used your PSD and turned all the extra Layers into the three Layers.  Similar to IamSam's approach, the brush patterns are isolated to just the area of the vector shape and then you can choose which colors and blends and opacity to use with the pixels of that Layer.   I consolidated your image for those shapes down to three Layers showing the resulting image below and also include the PSD file for your perusal. 

[ATTACH=full]115488[/ATTACH]