Street Justice / Fire Armor

During double xp weekend I made a Street Justice / Fire Armor scrapper. I from what I read here today plus the experience I had with an ITF last night makes me think I probably should have went Brute. However I made it to level 38 and plan to stick it out.

Is it worth taking Soul Mastery for Shadow Meld or would I be better off with Body Mastery for Conserve Power and Phyisacl Perfection?

Also any advice on what Incarnate Powers to take?

I haven't fooled around with builds on Mid's yet but I believe I can get close to soft cap for either melee oe smashing leathal defense.

I too have done a Fire Armor Scrapper, and realised that no taunt aura means mobs running around from Burn. But, it's not the end of the world. Burn's mostly front loaded these days.

If you're having endurance issues, you can take Consume, so I wouldnt waste your epic on that.

I'd have a look at where you can get Immobilises from to help with keeping enemies in your Burn patch and not running around.

Dark Mastery has Tenebrous Tentacles, which can do a whole group. But you want them clumped up first, which means enter melee to clump, jump out, Tentacles, back in, and then Burn.
Blaze Mastery (my pick) has Ring of Fire, which can keep a Boss immobilised pretty quickly.

Theres also the Spectral Interface ability, which adds a chance to immobilise (4 seconds only) to all attacks.
And maybe the Razzle dazzle proc in Sweeping Cross? Does that take Stun sets?

Fiery Aura, and I do use the Dark APP on my Claws/FA to root. If you've got a convenient wall, you can Torrent -> Tenebrous -> Burn pretty effectively.

Edit : Oh, and, I'd recommend just taking Confront over a single-target immob; it's more generally useful.