Flanders Red 2021

Today I'm brewing up 10 gallons of base beer that will go into my 30 gallon Red Solera (Aging Barrel #04). I previously filled it with recipes based on the Rare Barrel's Red base, but this round it's closer to my original Flanders Red base. This means I'm also getting ready to do the first pull off the Solera, so this is replace the amount pulled off (plus a little extra for an occasional top off. Here's the recipe as I'm brewing it today:

6.5# Root Shoot Pilsner Malt
4.0# Best Malz Chit Malt
10.5# Avangard Vienna
2.00# Weyermann Munich II
1.0# Best Malz Spelt
1.0# Monastique Aromatic
1.0# Weyermann Caramunich III
1.0# Castle Special B
Yeast Nutrient
56g Aged hops (60 mins)
Inland Island Brett Barrel III

Mash at 158F, 90 minute boil, ferment at room temp.  

Water Profile
I don't go too crazy on my sour beer water profiles. For today, I used about a 50/50 blend of RO water and carbon-filtered tap water.  

Brewing Notes
No issues. Since this was a larger batch, I used my 20 gallon Blichmann Mash Tun. Starting mash temp was a little low at 152F, but I was able to raise it to the desired 158F fairly quickly. I ended up with a little under 10 gallons total.

Readings
Beginning mash pH	5.29
Ending mash pH	5.26
1st running gravity	25 (1.102)
Pre-boil gravity	16.2 (1.064)
Post-boil gravity	19 (1.076)

Update 9/25/2021

I'd grown up a super healthy pitch of the Brett Barrel III yeast and had a blow-off the morning after pitching. Fast forward to today and I'm swapping out the blow-off for an airlock. I haven't taken a gravity reading yet, but there's still an occasional glug out the airlock.