You will need to use inkjet envelopes to get good saturation on some colors. Digi-M envelopes from Western State are one of several. Digi-M Inkjet Envelopes | WSEL
Stay away from Riso. The quality isn't there and the ink is also too expensive for print for pay. Aftermarket inks can bring the cost down, but the quality is only adequate for transactional printing.
If you are wanting to go 100% digital, then inkjet is priceless. One recommended addition is the Kyocera 15000c. You are limited to uncoated papers, but it delivers very-near-offset quality printing. It is an ideal machine to replace offset, especially for all of the spot color work you...
Adding opaque white to the mix has always worked out well for us. If the mix calls for white, substitute opaque white. If it doesn't, up to 5% in the mix can bring your color back. 5% being for darker material. Kraft 2%-3%.
Then I would lean toward heat, perhaps excessive, combined with the crappy paper they have been delivering that last few years. I really have to crank magnification to compensate for shrinkage. I don't get wrinkles or creasing with the belt fuser on the Ricoh.
What is the composition of the rich black? You can get too much toner on the sheet. When the first side fuses it shrinks and pulls the sheet into a slight pucker, then when it goes through the fuser on the second side it creases. I never go above 200%. 40-30-30-100
I'm sure it's near the lead end. Don't remember which side it uses for registration, though I think it was the non-op side. It was usually a solid with straight edge. Even a 3/4" square could do it if in the right spot. Do you have a media option for preprinted? That can alter the sensitivity...
I had a similar issue on a Konica. It's usually one particular element that it sees. I could often get around it by running the job 180 so it's looking at a different area on the sheet.
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