You might try mixing Styrofoam balls or vermiculite with your concrete. The right blend will maintain the density quite well and the drop in weight can be dramatic.
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Yeah, they're flush. The woofer is flush with the ring in the picture and I did the tweeter since then. The baffle is ready, I just have to get back to this project. I ordered some epoxy resin and I'm gonna try to make the other one where the drivers are mounted on cast resin rather than the oak rings. This is very experimental. I want to learn how to work with a bunch of things and am using this as an excuse to do it.