accumulator vs wyes

[RCOX]

Let me try this again. I have a Powermatic 1900 dc, I got tired of hearing the knots banging through the impeller when planing pine so started looking at the super dust deputy from Onieda. I then ran across your site and decided to try your design. I had 3, 4" main lines running through my shop. I brought these into an accumulator, then a 6" line to the separator and a 6" line into the dc. It seems that I lost some suction with this setup. My question is this, do you think I would be better off to remove the accumulator and bring the 4" lines into a couple of 6" wyes then into a single 6" line into the separator then a 6" line into the dc? If my pictures come through, I think this will all make sense. Thank you for the design (works great) and for any help/info you may be able to supply. (file too large, pictures to follow)