Digital BW, The Print

I am getting a lot of clogging and contamination between heads in an R1800 that I am using to mess around with various dilutions of PK and MK (using Glicerine,water/photoflo base) and GO in the same printer. 

I am guessing that the issues are to do with compatability as they occur after the printer has undertaken a cleaning cycle. As though the wiper is pushing gunk up into the heads.

Has anyone experienced any compatability issues with inks? 

Alistair