"It's a Tuber, Not a Tumor" Sweet Potato Bock [#57]

Brew date: Jan. 2, 2017
6.25 gal

Ingredients:
8.5 lb Pilsner (Avangard)
6 lb Munich (Avangard)
12 oz Cara 45 (Dingemans)
4 oz Midnight wheat (Briess)
4 oz Dark chocolate malt (Briess)
3 oz Acidulated malt (Meussdoerffer)
~2 lb Roasted sweet potato

3 oz Hallertau (2.5%) (60)
*0.25 oz Styrian Celeia (3.7%) (60) (Only had 0.10 oz)
1.5 t Irish moss (15)
Yeast nutrient (10)

2 L Wyeast 2206 Bavarian lager starter

Water:
Profile - https://www.brewersfriend.com/mash-chemistry-and-brewing-water-calculator/?id=DKQ9T4P
10 gal water - 75% RO, 25% filtered
4 g Calcium chloride
2 g Gypsum

Schedule:
Mash in 6 gal @ 130F
Protein rest @ 122F (20)
Sac rest @ 154F (50)
Heat to 168F (15)
Boil (60)
Chill to 50F
Ferment @ 48F

Target:
OG 1.069
FG 1.017
SRM 21
ABV 6.8%
IBU 25

Results:
1st run - 2.75 gal @ 1.087 - very slow lauter
Preboil - 7.5 gal
OG 6.25 gal @ 1.075

Notes:
1/23/17 - Gravity @ 1.022/1.020, raise ferm temp to 51F
1/29/17 - Gravity @ 1.020, diacetyl rest @ 60/62F for past 3-4 days, flavor cleaning up, lager soon. Cut out gypsum entirely next time. Heating to 65F for 24 hrs, then cold crash to lager.