I think my problem is me (smile) ie - I learned in another thread here that perhaps it is not the feeder but my custom size set up which screwed me up.
Anyway, just to respond:
1. My 6100 only allows increments of 2%
2. I have no idea why the delay - but honestly, I spent over an hour on two separate days trying - to the same end. It quequed it - did everything as before, then the data light flashed...but (normally) after a few seconds of "flashing" the printer display panel changes to say something like "printing xyz image"...
The printer display never "activated"...and it was getting late, I was tired, and 15 minutes seemed ridiculous.
My normal print time is about 156 seconds (I checked the printer details) - so something is not right - but I cannot rule out me making some error ...although I don't know what I could have done wrong - it seemed straightforward.
Anyway, thanks for the insight - this is good information for reference because the troubleshooting section in my manual is pretty simplistic (it says if the printer doesn't print - its becasue you haven't turned it on
....makes me look like a pro..ha!)