The new reds are an improvement, but the yellows and oranges feel duller and less glowing/fire-like now.
I feel your AA and general thinness of some of the intermediate colours make the fire look blurry, I think perhaps eliminating 1-2 colours and having sharper boundaries between colours would help. The blurring around the yellow part in particular makes it look like there's a rounded hard shape inside the flames, rather than like the hottest part of the flame.