Order a few new balls from Jim Waterman, who owns and operates foosball.com which includes these forums. The new ('11?) balls should be even grippier. They'd also help if you ever get to one of Canada's many excellent weekly DYPs.. West coast, east coast, cowboy middle.. they should be all competitive.
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Perhaps the word you're looking for, instead of "trap," is "PIN...." A front pin with the back of the player's foot or toe.. and a back pin with the front of the foot or toe.
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Mind you, I've had a few acquaintances who interpret every foosball term as a command: "JAR.." and they obey....