I reset the project twice now and aborted the WU. The first one had been going 12 days and kept saying it had about 11 seconds left. Today, on the same machine, there was one that had been going 26 hours and was still counting about 1 minute 11 seconds.
It's like the work units are in and asymptotic countdown that will take at least a month to finally click over the last second.

What other methods can I try to repair this?

The machine used to work and used to have two clients to split the work load. I tried merging the two ID's but the database says they are incompatible. Is this part of the problem? Should I try to force a new cross ID?

I only see one WU but the last contact was today and shows three WU in progress and that is after resetting the project.

55703061 54492885 7 Feb 2016, 5:48:07 UTC 17 Feb 2016, 5:48:07 UTC In progress --- --- --- Data collect version 4 v4.20 (nci)
55673139 54465380 5 Feb 2016, 22:37:22 UTC 15 Feb 2016, 22:37:22 UTC In progress --- --- --- Data collect version 4 v4.20 (nci)
55616038 54412637 3 Feb 2016, 22:11:02 UTC 13 Feb 2016, 22:11:02 UTC In progress --- --- --- Data collect version 4 v4.20 (nci)

Removing the project and re-adding seemed to get WU to actually report again but there are still 3 old WU that read as In Progress.

No way to abort them client side nor here.