I've found the best way to do it, considering your 4 drains is to have the gated drains cut low (like you have), then have the two emergency lines cut one 1" taller than the other. Put a 45 degree elbow on the top of the shorter one (make sure it's 1" shorter
including the 45) and have a trickle going down the shorter one. The 45 keeps it much quieter and you're able to get a smaller trickle. I still end up adjusting mine every once in awhile, but not often.
