According to this article in the Reefkeeping issue, the benefits of the Tangential design is that it increases the contact time in the chamber by swirling and allows for a lower performance pump to be used. So does it mean that a Tangential deisgn skimmer with a powerful pump will increase its effeciency even more?
http://www.reefkeeping.com/issues/2002-03/fm/
And also mentioned about the Direct Injection method, the benefits is that it allows for a shorter reaction chamber. The downside is that it requires a stronger pump as the bubble inconsistancies causes burping.
Since we are doing tests on skimmers, why not we try out these two designs and see which one effectively removes junk from the tank.