I have been researching speakers for my STEALTH too, as you know.
I brought my stealth home and plugged into my EVH2x12combo and the greenbacks. Sounded good. I currently use the Stealth through Splawn 4x12 with Governors. It does sound good. Just bought another pair of G12m reissues to try in the Splawn 4x12. Hell, wanted to go 4 G12m's so bought a third speaker from GC two days ago for $75 cuz I had a $50 gift card. Gonna hold off though putting it in cuz I might actually like the Greenback/Top Governor/bottom configuration i am gonna try. Maybe return the 1 speaker to GC, cuz I'm not gonna open it.
I was all gung ho on 4 G12m reissues, but Got cold feet a little bit for the style I play the Stealth with, which is Prog Metal like Evergrey stuff. The governors can be a little woofy on the lows...most eminence speakers have more lows...but figure they might be great in bottom and the greenbacks in top. Kinda like the friedman cab but instead of V30s(which i don;t like in person). I do like Mesa V30 impulses though when i record, a little ironic, but I know V30's are good speakers, but clean channel with V30's always leaves me feeling sick. hahaha I like a scooped clean.
As far as the EVH/Heritage. I don;t know? Never played through them. I hear they are bright by someone, then hear the EVH is a dark cab? Kinda mixed. I know to my ear, they sound a little like the notes stop on a dime. Listen to the Metropolis clips on youtube comparing greenbacks with his 1967 originals...It's like a 12minute vid and it really is a good representation.
Plus Tom, your ear has grown accustomed to the Splawn cab....been listening to it for years. All the sudden you get ear shock cuz there are new frequencies blasting your way.
Also, you told me you like your STEALTH through your splawn 2x12 more than your Splawn 4x12/small blocks in both. This might be cuz of Ohm setting. The Stealth to me sounds way better in stereo 8 ohm through my 4x12 rather than 16ohm mono. Sounds fuller and less congested. I know the EVH cab is 16ohm mono, and I am guessing your splawn 2x12 is 8ohm cab. Have you tried stereo 8 ohm into your 4x12, or doesn't your 4x12 Splawn have multiple options? Try it and let me know....
Rian