[MrG]

I would only raise the flop if I knew everyone would call. I would go for the overcall here and keep people in. But your reference to SSH and large pots is a good point, your raise forces everyone behind you to cold-call.

However, your turn check doesn't protect your hand as much as your flop raise. You need to bet here for the same reason you raised the flop: THE POT IS BIG!
In fact, it is much bigger than it was on the flop. While the six isn't a heart, pairing your six gives you more outs and is a scare card as it makes a st8 possible. I would think a bet here would do more to protect your hand than the flop raise.