Match Amp w/Tekton Design Lore

Dynamic is absolutely a word I would use to describe the Lores.  When you look through many of the threads and comments about high efficiency loudspeakers like the Tektons, Zu, Spatial Audio, etc.....you get a perspective of the different sound/presentation people get with Triodes, non triode tube versions, solid state amps, etc....usually, but not always, lots more "punch" and dynamics with solid state...but a somewhat less holographic sound...which can be partially offset with a tube preamp.

It sounds to me like you are at the point where trying a few different amps would be of value....and I'm pretty sure that being 5' out from the rear wall, you are losing low end....and by not using the sub you are losing some ambiance.

Gain is another word for volume essentially. And it sounds like gain isn't really the issue I may have slightly misread your initial post.

Perhaps I have a different meaning for "dynamic" sound. For me that has always meant like a 3d sound stage. And this is what I get with the bookshelves. It is easier to place the different instruments in a 3 or 4 piece band dehind the speakers. The Lores produce somewhat of a "deep" soundstage but in comparison they are just "there." Not completely, but to some extent.And snapsc, bass is not an issue even without the sub. I should probably try it for ambience as you said. But to be honest, depending on the track, the Lores can get somewhat "boomy."
But I did discover something that helped a bunch!The MIT speaker cables I'm using have flex pin banana pins but they are somewhat thin. When inserted into the binding posts on the speakers, even when tighten completely down they can still be removed and even turned. To me this is not a good connection! So Instead of inserting the bananas into the posts the conventional way I inserted them into the eyelet on the post and screwed the nut down tight. Good connection and MUCH better sound! I was flabbergasted! It is so significant that I can say with confidence that it is not a figment of my imagination!Long post so time to play around with speaker placement, subwoofer, and eventually possibly amplifiers. I swore I'd never go back to solid state and I still feel that way. Fun hobby!

I like this post from Steve Guttenberg to describe dynamic. It’s not an exact definition but pretty good. 

https://m.youtube.com/watch?v=tWqcu1wR1sw

I like that post and I can definitely relate to limiting myself to playing mostly music that sounds good on my system. I suppose we all are guilty on some level to be looking for the speaker or system that plays everything really great. I only hope when I find it I will be able to convince the wife that we need it!