Don’t scrap it, I think it’s looking pretty good! The first thing I noticed though was that the fire doesn’t look like it’s losing heat and “turning into” smoke. If you just change the life of your fire particles so that they are dying off as the smoke gets thicker, it will do a lot to make this look more realistic.
Like they should be dying off around here:
Another thing you could do with that fire is to exaggerate the horizontal stretching at the beginning, so it looks like it’s more violently shooting out of whatever the source is.