From the time I started this thread until now, I believe I have learned from all the responses (thank you!), and my hearing and perceptions have changed as well:
1) Yesterday (Sunday) in church "live band" P&W using the 315ce, to compensate for the other instruments (piano/bass/drums and another acoustic guitar) I backed off the "bass" knob on the 315ce's Expression preamp, and cranked up the treble eq knob on the mixer to "1/4 past noon" or "3:00" setting. Note I wasn't going for gold, but I was trying it as an experiment since normally I just plug in and go and don't scrutinize tone settings except the settings on the guitar. This backing off the lows at the guitar (and its a jumbo, it produces lows) plus increasing the highs at the mixer allowed me to hear my guitar much more distinctly through the mix.
2) I re-purchased (from GC) a new (2011) 615ce (Maple/spruce) that I previously purchased and then returned because I judged it to be "dead". While the store had it back, I pointed out the deadness, and the Tech there (and yes he is competent) agreed and replaced the strings w/ factory std. Elixir nanos. That literally woke that guitar up, it now sounds alive, well and toneful, yet with flat response. So this will eventually work its way to being #1 to use live Sundays. I now have a Maple guitar to try "in the mix".
I'm trying to have several different colors-on-the-palete to choose from: Maple/spruce, ovangkol/spruce, & sapele/spruce. I intend to use them all "live band" and otherwise.
-Gary K