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First, I have to assume you are decapping as part of the re-sizing process. I do not do this. I have a universal decapping die and knock the primers out of the cases before I wash and clean them.
Second, the RCBS primer catcher is not a particularly efficient design. There are third-party add-on primer catchers that you can get for the Rock Chucker that will catch nearly all the primers.
Third, try raising the ram into the resizing die more slowly than you are. Raising it fast does two things; 1) it imparts more energy to the decapped primers, so they are more likely to end up all over the place, and 2) it allows the brass a chance to "spring back" within the die rather than doing so after it has been withdrawn from the die.
If you want speed, get a progressive press. If you're going to use a single stage, then remember that the precision and control that goes with a single stage is not compatible with speed. A single stage press is truly in a race where the prize goes to the tortoise.
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