Anyone have an old overflow they're not going to use?

I redid my plumbing last night to get rid of all the 90's so that I didn't have to throttle back my return pump. It didn't help.

I just don't get it. I have two 1 inch drains, and my return pump is a Mag 9.5. The drains just can't keep up w/ the pump! At this point, I think all I can do is add a HOB overflow, or downsize the return pump.

Let me know if you have an overflow, or if you have any ideas.