I'm a pressman with 20 years in the trade running web offset M1000s, Sunday 2000s and Sunday 3000s. I've ran folders, inlines, and VITS sheeters....
Could there be a bad vibrator bearing causing the vibrator to hang down?
If the mark is in the exact same spot it's not a roller bouncing. Are you sure it's not water from the plate gap?
The Z roller, also known as a bridge, is mainly for when you have light coverage and/or no take off bars. When the roller is disengaged it...
Same watertrain? What shop you at?
I have been on multiple different web heat set presses (G14's, G25's, M1000, M3000) and we've always ran KCMY as well.