CJV30-160 / black color print issue

Hello,
I regulary have a frequently persistent issue to print black flat color - there are large fumes of others colors (mostly Magenta) on my print.

I have tried different CMYK options like C-0% M-0% Y-0% K-100%; C-25% M-25% Y-25% K-100% or even C-75,02% M-67,97% Y-67,02% K-90,16% as generated by my PDF + different vinyl profiles.. I even tried to print it as RGB file !.. but the issue is always there..(

Some ideas, please ?

 

I have changed my vinyl from DryTac to Briteline, my problem is not 100% resolved but its really much better and I can work with..