The deltalites seem to be fully broken in now and I'm MUCH happier. Lows and low mids sound are right in the ballpark I was hoping. Quick and punchy, not thin, but just right. On some parts, I'm missing the "envelope" of low end that a proper ported cab gives, but a little bass boost gets me close enough there. That's a trade off I'm OK will, as it's harder to fake it the other way. So, so far, if all the modeling is true, I should be happy with any of the drivers in the half of the spectrum. That's great to know.
Still need to pull the x-over and run them full range (assuming the stock x-over in this cab has a low pass on the woofer

). Hoping this is the case, as it's a little dull. I'm also noticing the beaming a lot more these days after moving back from a 12+6 cab. So I'm not ruling out a .5 alignment just yet, even with a vertical 2x12. The box does have a slanted baffle and tilt-back stand, but even then unless I'm 5 ft. in front of it, I lose all the highs and some upper mids.
Oh and my new (to me) V4B gets here at the end of the week and I can't wait to pair these up

Hmm, doing a .5 on the cab would also make it "TB approved" for horizontal use and I could actually set the amp on top.
Finally, in terms of volume, I think this will be enough for everything I do, and never be too much either. (I play with 3 guitars

but they're all currently in the process of down-sizing from 2x12's to 1x12's

) I don't think it's a huge difference from the stock speakers in terms of sensitivity AFAIR despite the stock cab being rated at something like 94dB. That said, I didn't really open up the TH500 on the speakers as I don't want to blow them right away.
Hopefully in the next week, I'll get the others going finally.