Didn't see the reply you posted to my question til now ! Have you tried used a cardboard stencil held a few cm away from the surface? Gives the sharp edge but with a small amount of bleed, which makes the fire shape but adds a sort of glow around it in the same colour. It's not something I've tried myself but did see tutorial by a painter that goes by the name phat bodies that was really good at realistic flames that used this technique.
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