[rainsong]

Sorry, I've never liked the sound much of an internal mic. It sounds like the INSIDE of the guitar, not the outside. It's OK the use to add a little ambience but if I had to choose I'd go with a soundboard transducer over an internal mic and only as the SECONDARY source of amplification. Sorry, I still prefer the UST, in my case the Baggs Element, as the primary source. Of the 3 Baggs pickups you named I think the Element is the most natural sounding. I think the only possible way to get a decent sound out of an internal mic is to EQ it separately like Sdelsolray does.
I had a Fishman Blender in my rainsong so I do have personal experience with internal mics. I think my Element system sounds better than the Blender in that guitar at least. If you like your RT through a PA but not your amp, maybe it's your amp that is the culprit?