Wow, this took some time to figure out (glad you did).
I have exact same pump Bubble Blaster 3000 the newest version. And it makes my skimmer insanely powerful. I i get around to upload the pics and video i will post it.
It is a cone but not a SRO, design is similar to vertex. Water level is very stable in mine though.
http://www.canreef.com/vbulletin/showthread.php?t=76429
I have replaced oem pump with Bubble Blaster 3000 for more air intake volume, oem was 700l/h BB3000 is up to 1400l/h.
And it seems a little too powerful for the skimmer size, so as you also noticed there is a lot of turbulence in the reaction chamber even though there is a diffusion plate on the pump output fitting.
So my solution to it was a plastic netting rolled in to a reaction chamber to reduce the turbulence as well as air intake control to reduce bubble size and turbulence.
Also a very good practice is to unplug the skimmer every time you clean a collection cup so your ventury is getting soaked and cleaned more frequently.