I have the same issue right now, I use DSLRBooth and just bought a Sinfonia CS2 printer, and I am finding that my images are printing blurry as well. I bought the printer from a Canadian supplier and they are well... useless for tech support.
Would you mind telling me the steps that you went through to rectify the issue? I have an event this weekend and I am dying to figure this out. Any help would be appreciated!
I am running Windows 10 on a touch tablet.