Thanks for your comments

There are a number of difficulties, and there is always a trade-off with these effects.
The aircraft crash smoke for example actually uses two smoke effects on top of each other, which would make my work here much easier, but unfortunately I only have one effect to play with in this case.
The problem I have with the burning buildings is that if you bomb one house the smoke is too thin, but if there are six buildings next to each other that get destroyed it is too thick. So the challenge is to find the right compromise between the two. Unfortunately I cannot tell the game to vary the smoke according to the number of buildings destroyed in close proximity to each other.
I will certainly try thinning the smoke out, but IRL it was generally pretty thick:

Don't worry, Dak - this smoke is from sinking ships. There is no need to target the ship again, it's already game over for them!
