I think this was mentioned before, in the original black hole script that is in the download section there is a small formatting error on line 17 of 1.xml. It reads:

file=keywords15.txt"-->"--></title>

It should be changed to:

file=keywords15.txt"-->"</title>

That might be the cause of some of your problems.

Replace all the "-->" phrases with " and try your feed.