Thanks for the replies. I've been stuck on the whole idea of boil off percent. Reducing the boil off by reducing the vigor and keeping the lid on for part of the boil is definitely in my future. I will strive to reduce the boil off as much as possible. I am also changing other parts of my process to reduce oxidation.
I'm also looking forward to Martin's presentation once it is released.
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FWIW, I start with a 7 gallon pre-boil, 60 min low vigor boil (boil off around 8%) and finish with a 6.5 gallon post boil. I transfer 5.5 gallons crystal clear wort into the fermenter leaving behind trub/hops and get 5 gallons into my kegs.
I think you need to change your moniker to "Brewinlowvigor" now. Just kidding, but those are obtainable numbers, for sure - other than the occasional instance where my boil is achieved more quickly than expected and I quickly lower it (electric brewing is so easy to monitor the approach to full boil temp - as long as you watch it!), I am also an adoptee of the low thermal stress approach advocated by Bryan and Brandon and their LOWO2 crew. Adjusting volume to get the right "net into the fermenter" is key.
I will anxiously await the posting of the NHC presentations, as sadly, I will be missing this one in Portland.
Have fun up there in Beervana, forumites.