Tube amp to drive Tyler Decade D1's?

Anyone out there with experience driving the new Decade line from Tyler acoustics with a tube amp? I am currently using a very sweet DNA-125 and ALD-1 (both with Gold revisions) from McCormack, and they sound as good as anything I have heard from a transistor setup. I was thinking of changing it up with a tube amp or tubed integrated as well, and was curious if others had some success or failures they would like to share with me. The speakers are around 90db/W efficient (they do seem to play loud with the volume pretty low). They are rated at 8ohm, but with multiple drivers, I wouldn't be surprised if they required more current than an 8ohm load should. I have already tried a couple of tube amps on them:

1) Cayin A-88T: surprisingly powerful, not any more full than the DNA-125 though, and a bit of loss of detail and also a bit hazier sounding. A great deal and enough power for this setup if one was on a $1200 (used) budget; doesn't match the McCormack's performance though. A higher-end KT88 type amp may be the ticket (more power wouldn't hurt).

2) Atma-sphere M60 MK2.2: Not enough juice for my speakers. They sounded very rich, but a bit flat, and lacking bass. I know these amps are very highly regarded (the guy who got mine was over the moon with their performance) but OTL amps and the Decade D1 seem not to be a good match.

Unfortunately, tube amps are nearly impossible to take home for a demo from a shop, as they are very hard to find. Even the McIntosh dealer rarely has tube amps anymore.