Problem with scuffing totally resolved on all media by setting the platen gap to standard. I had used wide on all fine art papers with my 7600 and I guess had assumed it would be the same with the 7900. I was also getting weird ghost images with the platen gap set t wide.....I am a happy camper now!
The nozzle clogs which are recurrent in the green are a little uncertain at this point. The tech put in a new capping station and the clog seems to move from nozzle to nozzle suggesting that it is likely air bubbles and not the printhead. Epson is sending me a full set of inks to compensate me for all the cleanings I have been doing to try and solve this and because a power clean has been suggested which uses a good deal of ink but apparently is quite good at purging micro-bubbles as well. This does need seem like it is insurmountable and they told me they will come on back out if the power clean doesn't fix it.
Oh, and by the way, the prints are great.
Howard