Before we continue, there is a slight chance that mark is getting that driver flex issue that I got when I started out with the DDMs. Mark, if you try putting your fingers on the port opening on the side of the DDMs, and put the DDM's in your ear while they are playing music, plunging them in and out a few times, you might hear a crinkle and one of the drivers might 'pop' back in - suddenly there will be more treble.
It's unlikely that's the problem, but there's a slight chance that may be why you loathe them so much - because the treble driver isn't even working. XD
If not, then I can share my own experience with the DDMs... when I first got them I also felt a little puzzled at how little treble they had. Over time though, I actually realised the DDMs had just as much treble energy and detail as some of my other IEMs, it just didn't spring out in the mix. Despite it all, if you listen to any well mastered slow, intimate acoustic song, you really should be hearing something magical!
For instance, last night I got onto this track: http://www.youtube.com/watch?v=u4izoTTkhcw Ghostly vocals, so much weight and shape on the piano notes. It's chilling.
Large aperture tips help a heap as well. Anyway, that's my ideas on it.