Choice of drink can overwhelm cigar's flavor...

[NCRadioMan]

Originally Posted by badbriar

With a Guinness, I'd normally have an Undercrown, Oliva V, or one of the dark wrapper Aroma De Cubas. No issues with those cigars holding their own against any beer or ale!

There is your answer. You can't expect a very mild, light bodied cigar like the Cusano 18 to perform the same way with Guinness as those listed above which are all med-full.