Interested Burn deck but I don't think there's enough spells to get the maximum value out of Soulfire Grand Master. Had seen a list running 2 Grim Lavamancer and 3 Young Pyromancer which seemed pretty cool without loosing too much burn. :)
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Not really a fan of Burning-Tree in this deck with Ash Zealot and Boros Reckoner in as you can't effectively B-TE into AZ. Agree on the Skullcrack but Stormkirk Noble is a really good creature for this deck need all the one-drops you can get :D.From my knowledge I would suggest for your SB; 3 Skullcrack, 4 Burning Earth, 3 Volcanic Strenght, 2 Zealous Conscripts, 3 Flames of the Fire Brand. I would also try and fit in 3 or 4 Rakdos Cackler to make your deck a bit quicker and a greater chance of a turn one threat :).
I'd drop the Rootbound Crag and Stomping Ground as there is no need for them :).
I like Bonfire of the Damned against aggro or small creature decks, however I'd use Aurelia's Fury against Midrange/ Control decks :).
Really nice deck, always nice to see someone else trying Grixis rather than all this Bant and Naya that's about in the current meta.