Pinwheel says you would be near perfect with a 340 spine cut 27.5" carbon-to-carbon with 116 gr on the front and 30 gr (approximate weight of 3 vanes + unlighted nock) on the rear. I remember your other thread now...don't you already have 340's with some extra length on them that you were struggling to tune? If so, you could trim them down, put in new inserts, and possibly save yourself a couple hundred bucks vs. buying/building a whole new set of arrows.
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A HIT is the best insert option for a 5mm arrow IMO.