Right. I tore out a bunch of PVC pipe that was originally glassed up under the cockpit sole and replaced it with wire reinforced hose leading down to the through hull on the same side of the boat; teeing the front and rear drains on each side.
Yes, a little water will come up into the aft corner of the cockpit when the boat is leaned over, but drains right back out again when heel is reduced and it's a LOT less then the amount of green water than gets trapped
in there when the boat is heeled over in nasty weather.
When the drains cross over, it works beautifully... when the boat is level. Of course it doesn't matter when the boat is level...
But when the boat is heeled over, water has to go from the low side drain UP to the windward side of the boat, and that means that the water has to be pretty deep in the corner of the cockpit before it will even start to drain out.