Peanut Butter Stout

[ROCBrewing]

Found a couple recipes and combined/tweaked to my liking. Now, I'd like some input on the brewing profile (see below recipe)Thoughts?

8.0 lb (3.18 kg) pale malt
1.0 lb (0.45 kg) roasted barley
1.0 lb (0.45 kg) lactose (15 minutes before end of boil)
0.75 lb (340 g) 60° L crystal malt
1 lb (340 g) Munich malt
1 lb (340 g) chocolate malt
0.5 lb (227 g) flaked barley
0.5 lb (227 g) flaked oats
0.3 oz (8.5 g) Magnum pellet hops, 13% a.a. (60 min)
1.0 oz (28 g) E.K. Goldings pellet hops, 5% a.a. (10 min)
Imperial Darkness yeast X 2 (any alternates?)
Added 1.5-2 oz of peanut butter extract to 5 gallons of beer at secondary

Mash @ 152-154 for 60 m
Mashout @ 168
Ferment @ 68ish
Carb 1.5-2 volumes

 

[Iliff Avenue Brewhouse]

15% roasted malt seems like a lot to me. I would probably drop the RB and Chocolate by 1/4# each but that is probably just my personal preference.

Also maybe simplify by using flaked barley or oats but not both. One pound of Munich may be unnecessary as well.

No experience with Darkness. I believe it is the equivalent of Irish Ale yeast (WLP004, WY1084)?