I have a problem

[Europhyllia]

Finally got all of the connectors and stuff and tried out my new set up today.

Old set up: Rio HF 12 returns approx 550 gph from the sump to the tank, running through one 1/2" sea swirl. This has worked fine but I wanted more movement. I have 2 overflow boxes on this tank rated at 800 gph each.

New set up: PanWorl/CL pump returns approx 1200 gph from teh sump to the tank running through TWO 1/2" sea swirls.
CHALLENGE: the TWO overflow boxes each rated for 800gph don't keep up with this much input (weird, right? I would have thought 800 x 2 is bigger than 1200...)

So possible solutions:

1) ball valve -reduce the flow of the PanWorld by adding a ball valve to the output side. Would this hurt the pump?

2) divert output - somehow divert som of the PanWorld's output immediately back to the sump rather than to the tank

3) closed loop - put Rio HF back into the sump to use as the sole return pump and create a closed loop for the PanWorld and the sea swirls. This also would have the advantage of a slower flow through the sump.
Not sure what a good fish safe solution would be for the intake in the tank for that pump

Thoughts, options, suggestions?

PS: what's really weird is that this should have just made it possible to run 2 swirls instead of 1 but it seems that each swirl has way more output than the single swirl had with it's pump. And why don't two 800gph overlows keep up with a 1200gph return?

UPDATE: I went with option 3 and I am kind of glad the initial idea didn't work out. Got rid of one of the overflow boxes which looks nicer in the tank anyway. 1200 gph through the sump would have been a lot.