I just experienced something similar to this with a DIY handle from SSS, new action was very hard to open with SSS handle and fine with factory knob. Due to tolerances from both manufacturers, some filing/grinding of the SSS handle was needed for smoother operating. The only pieces that should touch are the cocking ramps of the handle and baffle. If there are marks anywhere else on either piece the metal should be removed from the SSS handle to make clearance. Mine was binding as it slid under the baffle, so I would check that area out first and remove a little metal if necessary. I have also rounded off the handle cocking ramp on them before to break the sharp edge and this seemed to smooth the lift a bit -- be careful though, if too much goes your knob is ruined.
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