The 054A/B series using diesel doesn't seem to be immune to the problem, and a radical solution might be to blacken the top masts.Still tho, if the entire upper part of the island gets a coat of bunker oil soot every time she sails it is probably incredibly annoying to her sailers who have to clean her up. I wonder if switching to marine diesel like USN did would alleviate this. The 956 and 956EMs already switched to burning diesel iirc.