Tube or SS amp with Blue Heron 2's?

Recently purchased a used pair of Meadowlark Blue Heron 2's and have been a bit frustrated. These birds aren't singing for me. The sound is one dimensional, lifeless, flat, they just aren't opening up. Tried placement, cabling, even larger room but nothing working so far. Presently use a set of the Genesis M60 KT88 based monoblocks which have worked well with Meadowlark Swallows and Shearwater Hot Rods, Genesis 350, Von Schweikert VR4 JR. I suspect that the amps don't deliver adequate current for the BH's but will need to purchase another amp to verify this idea. I am curious what amps are working well for others.
System:
CJ Act 2
Esoteric X01
Genesis M60
Acoustic Zen cables