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Make sure you've lubed it properly and the tensions are on a reasonable setting. If it still locks up a ton, then you need to develop smoother turning; the Gan 356 X doesn't have lockup problems as long as you have decently accurate turning
I mained a Gan X for a while, but after a few months, it didn’t feel very nice to turn anymore. There are some cubes that have much better corner-cutting than that cube. From my limited experience with Gan cubes, the corner-cutting is never bad, but it’s never great either. Then again, I do think that I may have a defect.