Thanks for the responses. I've since been to two different venues and recorded four bands. Here are some random observations:
First night - small theater, stealth table-top recording.
The opening band was loud and "boomy." Three songs in I decided to turn on the LCF. Between acts I checked out the results with my headphones and the LCF clearly helped. The limiter was on as a safety net and sure enough I blew the levels in the first thirty seconds. My home test settings weren't even close to what I needed in the theater. I used a recording level between 2 and 3 to keep the peaks between -12 and -6. I turned all lights on the unit off (backlight and LEDs.) Monitored everything with a small squeeze flashlight, the bulb covered with tape for dimming. Main act was less "boomy" but I ran with LCF on anyway and am pleased with the results. Had no issues with the limiter.
Second night - large coffee shop, stealth table-top again. This time I was sitting sideways and couldn't block the view from behind the recorder with my body. I covered it discreetly (not the mics of course) but still felt exposed every time I leaned over to check the levels. Right before the show,I saw the comment about leaving the limiter off so I decided to try it. LCF was off as were all running lights. First act was solo acoustic and not too loud but I still wasn't confident about the levels, especially with the limiter off. With my poor eyesight, I starting wishing I had left the LEDS on. For the main act, I turned on the LCF based on the sound check I had heard. I also turned the LEDs on and immediately the guy across from me asked if I was taping. The green lights were on more than I wanted but there were plenty of quiet moments during the show so I didn't know what to do. Red never illuminated. I was never comfortable with my settings but hesitated to make too many noisy adjustments. Can't wait for the day I'm wearing the mics and can discreetly adjust the M10 in my lap. Might also need bifocals!
It's been a real learning experience for this old taper. Now I know some of the obstacles and will make some adjustments. Still analyzing all the results.