Lightspeed mic gain

I recently purchased 2 sets of Lightspeed 20-3G headsets and handed down our
20xl's to my son and daughter.

Last weekend was our first trip with wearing the 20-3Gs. With the radios,
intercom and headset volume levels all set at a comfortable conversation
level, the takeoffs turned out to be absolutely deafening. The reverb from
the props and/or feedback through the mic or ANR was much much louder than
the older 20xls. Conversation would have been totally impossible during the
take off roll. My wife said that they didn't get any better even when she
pressed the ear cups to her head with her hands. Once the props were pulled
back to 2400rpms, everything returned to a comfortable level.

A recent thread about mic gain got me wondering if that might be the cause
of our problem. Has anybody had a similar experience?

Thanks,
Jim