I went ahead and ordered the mag-drive upgrade.
I also called up MDM and ordered a replacement O-ring and drive seal to fix the leak on the smaller pump.
One other item that I'll need to change is I'll be adding a ball-valve to the return from the main pump AFTER the T for the manifold. This should allow me to send some more pressure down the manifold line to increase flow through some of the equipment.
I created a quick youtube video with a little walk through. I've since quieted down the overflow quite a bit.
https://www.youtube.com/watch?v=MpJtIJ560Jg