Just switch the beaters, because they suck, and practice. They take some getting used to. They can be hard to control at first because its almost like they want to go faster than you do sometimes. The whole action is way different than normal pedals because of the longer footboard, so you're basically wasting your time if you're trying to get them to feel like regular pedals. But then I assume you wouldn't have bought them if you wanted them to feel like regular pedals, right? Oh, and also, the "sweet spot" seems to be further back towards the heel plate than on other pedals. Thats where the speed comes from.
A drummer friend of mine hates them because he says they feel like they move forward when you kick, but thats because he had his feet way up towards the beaters as if they were regular pedals. The purpose of the longboards isn't so much for drummers for bigger feet, they're for gaining extra leverage so you can play stoopid fast. When you get back towards the heel plate with the ball of your foot you can get the full range of beater motion while barely moving your feet. Thats why longboards kick ass. Ergonomics also helps them to be awesome. I can't remember ever getting tired playing axis pedals.
Don't give up on them till you've had a good chance to get used to them. It could take weeks. Patience, grasshopper.