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our sandwiched friend definitely had a draw (likely a 9) and maybe two bets could fold him out.
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There is no chance anyone with outs against you is folding here. The pot is just too big.
I don't think you can protect your hand very much here the times you're ahead. The trick now is to balance getting value when ahead with giving action when behind.
I agree that a turn c/r exposes you too much: almost 100% of hands that beat you will threebet. I think you get threebet a lot less if you c/r the river,
SpicyF style , so that might be something to consider.