Maybe in the future.
Doug, I know that, and its very tempting to do, but unfortunately I share the same worry as newmission. My degree is in Computer Science so I know very little about fluid dynamics. There is just too many things that COULD impact performance and sometimes its the smallest thing that makes the disproportionately huge change in the result. I know in some instances even adding a small obstacle actually improves air flow, so I just don't know. Newmission seems to have made a pretty good setup through a mixture of thought, trial and error, and luck. So I'm first trying to replicate his results and then work on improving them.
I agree with newmission that more holes should have been used, but I also think that they should be positioned differently, thus I am making them a little smaller, closer together, and concentrated closer to the tube end