I've found that sometimes a slight rotation left or right with the ''Rotate Step 2'' can make a difference on occasion. That or looking to see if there are two triangles positioned over one another with one slightly to one side or another of the other and then reposition one of them to sharpen up the image. It varies between flames. You just have to experiment to see what works. That and a lot of the " Control + Z " while messing around to correct mistakes.
Another thing that I do is to render the images larger and then just reduce the size in post editing to sharpen up the image.
Thank you. It's one of my first, but still a personal favourite - if I could make this bigger I'd have a print myself. I've stopped doing the heavy post-processing, mainly because the software for it crashes with larger print-size images. If I could fix that, I'd do more like this one.