Sounds like you have a version 3 drum, which is standard. If you really want to punch it up, you can use a version 1 drum which fires one at a time. Major, probably too much flow, but with those split returns on the bottom, maybe not.
One other thing you might try, is cutting the top half of the bottom 45s off at an angle. If you look at The Wuf's thread on OM's site, you will see that is what he did. What that does is reduce the angle to about 22.5 degrees and gives a higher trajectory to the flow out of those returns and improves the surface agitation. I was going to do that, but just didn't.
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