In case it is of interest to anyone, I received a Peltor lumberjack helmet tonight and switched out the muffs with a Peltor 10 series (regular earmuff style). I wanted to try that because the Peltor 10 series muffs are by far the quietest muffs I've every used period.
First impressions with the switch is that it is going to work out fine and be even quieter than my Elvex Pro which claimed NRR 27 although I don't quite believe it.
I'll put it to the test tomorrow finishing off blocking out a 36 dbh madrone I started this afternoon. A friend called me from the site telling me it was too big for him but access was good. Turns out it was on a sandy slope that about killed us wrestling the rounds down to where we could cut them up. (We could hardly even stand up.) I told him that I was going to buy him a beach ball and when he called me up and told me a site was good, I would ask him if it passed the beach ball test. If you set the beach ball on the ground and it immediately runs quickly down the hill, it is too steep to wrestle big wood. He laughed, but I am serious. I know what he is getting for a late Christmas present.