Chopper, if it still misfires in DA after cleaning and checking the hammer strut, we need to get some measurements on my gun compared to yours and see how much shorter the stroke is compared to mine. If it really is shorter than normal, we (or a real gunsmith) will have to figure out why the trigger bar is coming off the hammer too soon. On my SIG's, I had a defective trigger bar that caused this. On the CZ, it could be the roller, the trigger bar, or the hammer notch, I think. I would have to take one of mine apart to refresh my memory. Haven't done that since making the videos above early this year, LOL.
Joe