I am beginning to think that evap codes are tripped on the basis of magic. Any empirical or magical suggestions? Looks like I'll pull the tank and inspect the pump seal.

 

A medium leak that comes back after being erased is likely real. A medium leak should be much easier to find than a small leak and may be a breach of 0.020" or so. Dry-rotting and cracked rubber hoses were common leakers.
Chrysler TSB# 25-004-01 gave additional diagnostic help for those more difficult evaporative repairs.
I would try another smoke test. Something is being missed here.

 

Thank you Crown. I got the tank off today and replaced the pump seal just for good measure. I reassembled the fuel filler tubes and pressurized the tank with 2-5 psi or so. I then went ahead and poured soapy water over everything. The small fuel hose leaked a bit regardless how tight the hose clamp was on. So I cut 1/2 inch off each, scraped the rubber off of the tubes, then took steel wool to them. I also cleaned the inside of the rubber fuel filler hoses to make sure there was no rust or whatnot in those. I also replaced the 2 3" hoses that connect the evap hard tube to the top of the tank. I tested it again and it does not leak. Hopefully that was it. Should I erase the code, or drive it and see if it erases?

 

Yup, it appears that the small filler hose being gunked up with rust was the culprit. Thanks for all the help!