PLO8, how much to bet when you flop nut flush?

[Wintermute]

Let's say there's two high cards and one low. Take this hand for example:

$400 PL Omaha Hi/Lo
Seat 4 is the button
Total number of players : 7
Seat 2: Hero ( $400 )
Seat 4: papafatstaxs ( $183.30 )
Seat 6: bolzy ( $317.10 )
Seat 7: phuckthefill ( $326.88 )
Seat 8: cassdog ( $244.20 )
Seat 10: aliceroo1 ( $224.72 )
Seat 9: delDuero ( $97.94 )
bolzy posts small blind [$2].
phuckthefill posts big blind [$4].
delDuero is sitting out.
Hero posts big blind [$4].

** Dealing down cards **
Dealt to Hero [ 5s 2s Ac Tc ]

cassdog calls [$4].
aliceroo1 folds.
Hero raises [$14].
papafatstaxs folds.
bolzy calls [$16].
phuckthefill calls [$14].
cassdog calls [$14].

** Dealing Flop ** [ Jc, 9c, 8c ]

bolzy checks.
phuckthefill checks.
cassdog checks.
Hero ?

You obviously want a small flush to play back at you--even a set or two pair might get stupid. I know it's situation/player dependent, but anyone have a good idea for a rule of thumb? Emptyshell, I'm hoping actually you might be able to run some automated searches through your HHs and see if you have a good answer, although maybe that's too much to ask given that there's probably a european babe face down in your lap...