Hey Troy,
Yeah unfortunatly they dont handle much, but what ive done in the past is also use the bulkhead that was intended for the feed line as an additional drain.
Tie the two together into a manifold, and you can bring your feed line up the back and over the rim instead.
Its only another 3/4" Drain, but probably will handle an additional 5-6 hundred GPH.
Marc.
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