Bloody Microbubbles

I'm back again with my next glitch *sigh*. I'm getting a large amount
of microbubbles back into my display tank. I have baffles installed
after the skimmer section and before the return section. See pic
http://www2.cecomet.net/sgrien/sump1.jpg
As you can see, I even added another baffle before the return to avoid
the waterfall effect.
It seems that I have so much flow through the sump that the
microbubbles never have a chance to surface and pop and are being
forced through all the baffles and back to the return pump. I have no
liverock and I have just been circulating sw through the system. Will
this problem subside once I stock the tank and sump with liverock or
do I need to stick some floss or a sponge in the last baffle? I am
concerned about creating a nitrate factory with the latter and
possibly restricting the flow too much. Did I maybe select too large
of a return pump (mag 9.5)?

Just wait, someday I will have something to contribute here instead of
pestering everyone with questions. Thanks for your Ideas...again

Scott