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Gonna take a shot in the dark here and ask that you turn the hop-up off completely (disengagd). Then try again.
The bb's might be pressing up against the hop-up too much causing it to lose fps. If there is a magazine spring tension difference between the two brands, then it might be the case that one is feeding bb's too hard into the hop-up.
This was the case for my aeg with a low-fps set up where my m90 spring shot 180 fps when the hop-up was engaged too much. Shoots 270~ with it off...
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