I fiddled around with it some and improved it to where it pretty much works right. The reason all my primers were going into the right tray and almost none in the left is that there was some sloppy molding flash in the left side ramp. I trimmed that out and now both sides get primers.
I also fashioned a quick spacer out of some folded over corrugated cardboard to press the inlet of the catcher up against the ram, much as JustSomeGuyInCA did with his wood spacer. I made another cardboard piece that goes across the from "A" section to keep any primers that fall on the press body from working their way back under the catcher.
Since I didn't have a soda straw in the house I cut a piece of cardboard about 1/4" wide and 4" long and folded it over and stuffed it in the slot on the front side of the ram (I use a hand primer), and that stopped 'em coming out the front.
Then I wanted to fix the problem where the molded plug on the right catcher is bigger than the hole in the press it is supposed to fit into, which caused the right tray to be spaced out from the body of the press. I cleaned up the molded hole in the side of the press with a 3/8" drill bit and used a Dremel to take the edges off of the molded button on the catcher so it fits in there easier. Now the right tray snugs up closer to the press.
Last, in order to avoid spilling them while emptying the idiotic contraption I just use a small hand vacuum cleaner and suck them out of the "catcher".
This really is a shamefully badly designed product though, and RCBS should hang their heads in shame for releasing it this way. It would have been just as easy for them to do it right as it was to do the slipshod job they did.