[Kuso]

$20 would have been more likely to fold a janky low while still getting a poorly played flush to pay off.

the problem here is that bad players won't fold a two-way hand like any flush + any low, so i think you may have had more fold equity earlier in the hand.

regardless, once the river comes around, i don't think your bet size is really going to matter that much -- either villain is calling or he's not (unless you're A LOT deeper).