IME, you can get pretty good flow through a sump without microbubbles. What I found with my previous sump is that the number of baffles is less important than having enough distance in between them for the bubbles to pop. I'd suggest:
-Going with more than an inch between the 2nd and 3rd baffle (going from right to left, skimmer to return).
-Making sure that you can accommodate the ideal water level of your skimmer (10" for my octopus) by either reducing the depth of the skimmer section or by having enough room in the to put it on a small platform
-Skipping the first baffle (from left to right, fuge to return) in the fuge and just going with the 2nd and 3rd. You won't have a microbubble issue from the fuge, so the baffles will just be to prevent a ton of chaeto from getting into your return chamber