Picked up the chestguard last night from a tier 5 TH mission - rich yield I think - with TH at 400 and Kira on an affection rating around 3000. Spent the last week or so with T5 and Kira running tier 5s solidly but totally worth it (thanks to Gwaine for the advice).
Just need the belt now, willing to trade boots, gloves, greaves and headpiece + credits, hit up Elricev on The Harbinger if you're interested!