First, make sure your needle wasn't in there upside down by accident. Sometimes I do that, and my needle flops around. You shouldn't need to bend the needle like you would with a coil machine. If you bend it at all, just a very slight bend closer to the needles than in the middle should work.
Sometimes the types of disposable tubes you use can also have an effect. I find that with some of them, I have to put my needles in upside-down (with the bar on the bottom) and use a slight bend the opposite way I usually do it. Otherwise, the needles sit funny towards the top of the tube.
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