I've scaled a Coffee Amber recipe that calls for 12 oz. of Caramunich I, but my LHBS only stocks Caramunich II. So I'm considering going with 8 oz. of Caramunich II and 4 oz. of Crystal 10 as a substitute. Since 12 oz. is only 5.8% of the grain bill it would seem to me that makes a reasonable substitution unless there is something else that makes more sense?