I have that setup right now in my sump. I needed to raise the water level in my skimmer chamber a bit, so i added an extra 3/4" to the last baffle. You are very right with no turbulance in the first chamber, seemed like a good idea, didn't notice a change because i had no bubbles before and none after. When i had low flow it worked great, I now have 2500+gph going there, and have micro bubbles everywhere... but no hair algae.
If you have the water level close to that height in the return chamber then the raised baffle is great, mine lifted the flowing water another 3/4", creating more waterfall, creating more bubbles. If you had another "down" baffle you could get rid of this. It's what i plan on doing shortly, but need to figure out how small to make it so that it's functional
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