In the example, I can't comment on anything generally wrong with the CR because you are in a better position than me as far as knowing Hero's tendencies. It appears that you exercised a good anticipatory read of his all-in. The objective on this flop was to get his chips in, and you did that. Secondly, even though you've flopped a nice full house, you don't want to give him free draws to a better full house or low (if hi lo split); therefore, a bet of some kind out of position would be understandable and possibly encouraged.
1. There are some videos on Full Tilt that I do remember viewing about PLO. These videos may be lurking around, and there are plenty more articles from their pros available online regarding PLO and Fixed Limit.
2. You should vary your play to keep pace with the dynamics of the table and can disguise your style in many ways and adjust to each player. Don't be afraid to occasionally be caught playing garbage hands or bluffing
, since you need some action. You generally want people to think that you are a loose or weaker player than they are. Obviously, you do not want to be predictable -- but you want to appear as easily read and predictable.
3. You should be willing to employ and be seen demonstrating both. Each move can provoke different responses that only you would know after reading the player. In your example, the CR worked. Against an aggressive player, donk bets or blocking bets can incite raises and all-ins in response as well. They also ensure that a draw will cost them SOMETHING; A CR attempt runs the risk of allowing free cards through, which is a potentially VERY costly mistake. A donk bet may result in a fold (also bad if you wanted action). You should be seen performing CRs and donk bets to keep opponents off balance. That way, opponents may be hesitant to bet into you at times where you DO want a free card. Opponents will then know that a check or a bet out of position from you can be equally dangerous.
That's my own opinion, obviously.