OK, I'm starting to suspect the 1430 here is going bad. Running FM3, printer is not too old, but over a year.
Positives will 'skip', but not the whole thing--as if one or two jets is a half inch out from where all the others are laying down the image.
It usually does this for a half inch or an inch, and then resets, sometimes it's just a little weird on the whole thing, sometimes it's just crazy.
Occasionally it shifts across the feed direction, but usually in the print head direction.
When I use the stock driver for text, there will be what appears to be scan lines in the text, as if a few jets of print just crapped out.
Anyone else dealt with similar issues?
FWIW, ports are set up proper, and Inkman's great post on the FILE: issue helped me with that.
The bad parts look very similar to what happens when the stock driver and FM start fighting.