I'm looking for some tips on how to reduce the alcohol character of big beers. I'm scoring in the 36-39 range with my big beers (A. Barleywine and RIS specifically) but I perceive, and I'm getting comments back, that the alcohol is too obvious. I've been doing this beers with large stirred starters via Mr. Malty Calc - usually 4-5 L with one pack of yeast. I ferment at 65 and increase to 68 during the last part of fermentation with Wyeast 1056.
The part of my fermentation process that I feel least in control of is my O2 levels because I use a disposable tank and can only "measure" the rate by sight. I've been going for 1 minute at a rate that turns over the surface of the liquid similar to a moderate rolling boil. It's possible that I'm using too much or too little O2. Could that be the issue?
I'm looking to take these beers to the next level and I feel like this is part of what's holding them back. Certainly I've had some commercial beers where the alcohol was better hidden than in my attempts. Any tips would be greatly appreciated.