I'd try to adjust your transfer settings and weight. +15 transfer is a good place to start if it continues that way its likely the quality of the paper of you will need to have a technician come to make sure your drums and developer are within lifespan.
Have you tried kicking your transfer settings way up?
We run alot of Mohawk Everyday Digital and have never had this issue besides cracking, which we fixed by prescoring before folding. Don't let your tech tell you it's just the paper that is a very common digital stock!
In our shop I run two KM c6100, typically when I am running a textured stock (felt,linen,stipple,etc.) I will turn my transfer settings up +30 and my heat +15 it gets a decent result. I was wondering if anyone else has come up with a better solution for getting the toner to fuse in the recesses...