Eric,
Some things I ran into myself with the 3's in the past.
At first when I had them it was me picking them apart what made them better than the 2's. There was better fleshing out of the details but was the cost worth it? At first the answer was no but I spent more time with them and came to like them more even after letting them go.
Two things really changed my opinion of them for the better; the tubes I used on the BA and the cable. Out of the tubes I have stashed away, I like the green label Sylvania 6sn7gt or vt-231 by and far and in my experience the best choice of driver tube that I have found (I don't remember the exact version but the plates are not triangled). Luckily they aren't rare or expensive!
The cable thing I really didn't want to believe at first. I am not a fan of expensive aftermarket cables. When I swapped to a stupidly expensive ALO reference 16 cable the difference was night and day and I coudln't go back. I don't think that putting $6-700 is a smart move necessarily but maybe something more reasonable can lead to similar performance gains. In hindsight I wish I never sold off that cable! Perhaps it was decreased resistance or something that made the difference, I still need to figure out what the hell was going on there.
I don't have a Dynahi but out of my gs-x with mk2 modules they were not really my cup of tea, could have been a source issue too at the time I had a Lynx Hilo and it may have been a little too analytic. I know lots of folks recommend the GS-X mk2 for the LCD-3's but I'm just not seeing it, maybe it is the mk1 vs mk2 difference makes or breaks it but I doubt it.