This is probably being caused by dripping from your cleaning station. While you did say exit roller the cleaning station is the most likely culprit for the spread of imaging oil on rollers. Check all the way across the cleaning station...perhaps towards the back of where the cleaning station is...
mukomio,
Just finish a project looking into printing white on dark substrates, your choices are Indigo, iGen, Ricoh 7000 and what you have appeared to already test...the OKi. Given your reaction of price to the oki I would say the others are out of your range also. A key component is...
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I can be found here:
https://www.surveymonkey.com/s/PrintPlanet
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