I'd say take out the Ash Eater and Immolation, Immolation decks are real good but obviously that's not your focus, so I say scrap it. Add in 2-3 Deflags; it's still a fantastic card, you better make use of it.
Maybe take out a Dragon or two and add 3-4 Phoenixes. 6 creatures isn't enough in a rush, IMO.
Fire Bolts and Rain of Fire are just fine in my opinion, but you should experiment with Rage Pots and see how you like it. A Fire Shield might be worth throwing in as another control option, particular if you go the stallier route and go lighter of Deflags and higher on Fire Bolts.