Joe,
I'm, no dust collection expert, just another isolated woodworker trying to get a sense of what is effective.
I have, however, read the material on several sites including the invaluable but nearly unendurable Bill Pentz-generated content. I accessed it through a link on the ClearVue site. You could also Google Bill Pentz. The whole body of information pops right up. Pentz knows his subject better than any other researcher/teacher I've encountered though he desperately needs an editor and website designer.
My hunch is that your equipment would be satisfactory if you would eliminate that 15' of 4" hose which is unbelievably dirty aerodynamically. Replace it with a shorter run of well-sealed smooth duct with no 90 degree bends.
If that doesn't produce the results you need, increase airflow through the chip path between the cutter head and dust pickup by either drilling air intake holes (who wants to mutilate their machine?) or by re-spacing flow-restricting planer covers. Maybe using longer bolts and stacks of washers to mount one of your planer's panels would improve air flow to the necessary degree.
Good luck. Keep us informed of your findings.
Mark Koons