I've seen A. elm get stuck on hydraulic and PTO splitters.
I could see it needing more time to dry, if you have a lot of sparks from it, it may not be dry enough. Red elm is worse, since it uses several rings for sapwood conduction. (U. americana uses just one, which makes it so suseptibel to DED).
There are several BTU charts out there, this is the best I've found yet. It shows how much of a cord is needed to get 1MBTU.
http://**********/what/heatvalues.html