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many players bet the flop in a multipot but then check when they see several callers.

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Yes, true. Not many players have the guts to bet into a huge field - including a preflop raiser - twice. Let alone with a lone [img]/images/graemlins/heart.gif[/img], which is what I'd put CO on. It sucks getting raised on the expensive street on a draw with one card to come, so I'd say that most players check the turn here unless they flopped a flush.

I'd make the flush chasers pay through their noses on the flop. It's a perfect opportunity to face the field with a double bet. Take their money while you still think you're ahead.