Just looking at your plumbing...If you've got two bulkheads in the bottom of each overflow, you might consider using both as exits. (It looks like you are using one of the bulkheads in each for a return)
If you could stand to run the returns over the top of the tank, you could get a much quieter system. If you would like to listen to the difference, you are welcome to visit... but you'll have to do it soon as I'm going to take water out of the tank by the end of the week.
You would also need to purchase a couple of gate valves.
Trust me..the difference is truly amazing. Best to do it now, than wish you had done it later.
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