blind battle: would you cbet/del cbet here?

I’m very tight, so would’ve folded pre.

As played, I’d bet OTF to see where I am.

As played after that, I’m folding OTT.

1) Depends on BB, not in my "standard" open range but since ppl fold too much and I exploit them a lot my SB RFI is about 70%
2) No, you are OOP and no need to cbet crap
3) Yes, it is often autoprofit
4) Yea I guess so. The problem is that when you check twice any decent villain should start barreling air here because you just fold way too often. That is why I like taking a stab OTT instead of checking again.

I think the open is on the borderline. Not eggregiously so, but I think the limit should be closer to 86s -- you should check out w34z3l's open range charts which are divided by position. I think if you raise, then c-betting here is fine. You caught a piece of the board, and will fold out a lot of hands like A3o, A4o, and hands with two diamonds in them that missed. By checking you are giving away initiative -- will you check to showdown and hope to win on the pair of 8s alone?. Your plan to take initiative and be aggressive with a weak hand was fine, but you sort of change your mind by checking the flop. As played, folding turn is fine