Have you tried adjusting the tensioning screw? It's a little phillips head screw above the operating lever. It holds the measure together. You can actually take that screw out and the measure will pretty much disassemble itself. While it's apart, look for burrs, rough spots, etc. Then reassemble and set the tension on that screw to your liking.
I can't help you with WSF powder. All I've ever run through mine are Unique and Bullseye. I know that if I have the tension screw set too loosely, it leaks Bullseye, so I've got to get it snug. Be careful when you're snugging that screw because it threads into plastic.
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