I don't think because we have a big draw we should automatically raise it in position on the flop. Our hand is super disguised. I would never put someone on 85s if straight gets there on the turn. Just calling monster draws is actually pretty +EV cause even supposing you had 98s (for the slightly better 9hi), people will take it out of your range when you just flat the flop.
Turn has to be a raise surely. I think you should pot the river also as you have like no 8s in range as played.
BTW something PLO players tend to do when playing NLHE is overrate suited hands...pre is a fold.