Found that 90 mins was not long enough to hit OG, extend to 120 or longer if necessary. Lucky to hit 60% efficiency in the extraction, but will either up grain bill, or boil longer next batch.
Get as much aeration as possible when pitching yeast. Pitch entire pack of rehydrated S-04, or whatever - just be sure to pitch a lot.
Ferment lower end of yeast ideal temp - for S-04 Fermentis suggests 59F. Ramp up temp to finish.
May also barrel age if you want. I have some rum barrel chips that may go in... May also consider aging prior to bottling, but that’s up to you. I am simply fermenting to FG, maybe hit a couple days on rum barrel chips, then bottling, bottle aging, and then drinking in a few months.
May need to bottle with fresh yeast. Bottle condition for as long as you feel necessary. Many barleywines hit their stride at 2 years aged.