Feedback on my RIS recipe

Beer Recipe Design
1

I’m relatively new to brewing imperial stouts. I’ve brewed a ton of porters, scotch ales and old ales, but I’m still sort of a newb to putting together a recipe for an imperial stout. Any feedback is more than welcomed.

17 lbs of Marris Otter Pale malt
1.5 lbs Roasted Barley
1 lb Special B
1 lb Chocolate Malt
.5 lbs Carapils

4 oz Target pellets @60 min
1 oz UK Kent Goldings @30 min
1 oz UK Kent Goldings @15 min

Wyeast 1728 Scottish Ale Yeast with a starter.

Shooting for an OG of ~1.100

I was also considering adding maybe 3-5oz of baker's chocolate @15 or cacao nibs to the secondary but wasn't sure if that would be overkill on the chocolate. I know a lot of people associate RIS with the kitchen sink mindset of throwing everything you can think of into it but I want to make sure I'm not over doing it. Looking for a good chocolate profile but not too over the top. Thanks in advance.
2

With all the malt, you could drop the carapils, won’t need head retention assistance. The roasted barley seems a little heavy to me, would drop it to a lb, too.

3

You could seperate a gallon when you rack to secondary and drop a few nibs in that. If it ends up too much blend it back in the rest of the batch.