forgot to post this earlier this week. so i dryhopped in the primary at 70df (not my current protocol, but for this ESB i went with it). noticed some faint airlock activity about 1-2 days in to the dryhop period (1 bubble every 40 seconds or so). checked the gravity about 2 days before I planned to keg and it was 1.013, and checked prior to kegging and it was 1.013 again, so somehow activity either kicked back up or I picked up a bug while dryhopping.
hoping for the former - and if so, I wound up getting the high 70s attenuation i expected.
its been chilling and carbing all week - hopefully i can steal a sample out of the keg over the weekend (it won't go on tap for a few weeks) and determine if it turned out all right, which based on the hydro sample i beleive it did.