1st inconsistent/low efficiency BIAB
Brewed an AIPA this weekend, 5.5gal post boil batch
est OG 1.068, actual OG 1.059
2.5# Rye Malt
12oz Wheat Malt
5g cal chloride + 5.5g gypsum
20qt water; 12qt tap, 8qt RO
30qt aluminum kettle with paint strainer as mash tun
over shot my strike temp a little, doughed in at 167°, temp was 157ish after dough in so i stirred for several minutes until it got down to 153° (stirred this batch more than I ever have before and i normally stir like crazy as it is), put cover on and wrapped in sleeping bag for 60min.
pH was 5.0 = ~5.3 per strip adjustment and was 5.1 = ~ 5.4 after mash
moved from sleeping bag, temp was 149°; put kettle back on the burner for mash out to about 170°
i also had another smaller pot with about 3gal of 170ish water inside to dunk sparge the bag
i normally hit 70% post boil efficiency with the last 5-7 or so AG batches with relatively same method, same grain mill from LHBS, in fact it even seemed like a finer crush this time
i forgot to do a preboil gravity check so I missed the chance to add some DME during the boil but will prob add it to primary today or so
per beersmith my estimated post boil efficient was 60%
any ideas on what could have caused a 10% drop?
i used same grain mill to crush, same equipment, i've done a larger amount of grain before with same system but had slightly lower water ratio to fit it all in
i thought maybe the rye didn't get crushed as well since it's finer but i didn't notice many if any intact rye hulls, also wondering if perhaps rye needs a longer sach. rest and perhaps didn't fully convert?