Ended up soloing Heroic Magmaw and Heroic ODS last night. For both bosses, I used full tank gear with DPS trinkets and my DPS Shin'ka (496 ilvl, Rune of the FC, both gems). Initially I started off attempts using full DPS gear, but quickly realised that the Enrage wasn't the issue- my survivability was. It was a little close on Magmaw, but he ended up going down nonetheless.