Yeah, something sounds off about an FG in the 1.020's. Even when I brewed the BCS recipe as-is with CaraMunich III, I finished in the 1.012 range. I have since replaced the CaraMunich with half as much Aromatic. It boosts the crusty/toasty/Munichy goodness that I like without adding sweetness or fullness.I just brewed 10 gallons on saturday. Essentially BCS recipe for half and the other half git the same percentages of pilsner, munich II, and vienna, leaving out the caramunich. I made the BCS version last year and could not get it to budge from 1.025, down from 1.056. It turned out darker and obviously overly sweet. The overwhelming thought from the forum was to leave out the caramunich, so now I can compare for myself. Good luck with yours when you do brew it again
I use some carahell in mine- finished 1.012 and 1.011 on two batches this year.