So far I've basically been playing 6-max exactly how I play FR when the first three fold...I don't really know of any general post-flop adjustments I should be making.

Here's a classic FR situation where I'm inclined to lay it down due to being OOP unless I've got a read the guy's very aggro.

I had no reads. Good laydown in a 3-way? What about if UTG wasn't in this?

Party Poker No-Limit Hold'em, $1 BB (6 handed) Party-Poker Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

Button ($84.20)
SB ($56.04)
BB ($288.05)
UTG ($126.38)
Hero ($122.30)
CO ($98.50)

Preflop: Hero is MP with J, A.
UTG calls $1, Hero raises to $5, CO calls $5, 3 folds, UTG calls $4.

Flop: ($16.50) 8, J, T (3 players)

Hero bets $12, CO Raises to $35, hero ... ?