I spent some time polishing the feed lips on my CZ527 magazine with wet dry and then buffing compound.
It did not make it as smooth as a push feed, but it does now feed reliably and does not jam.
I also pulled the magazine follower spring out and gently bent each coil back on its self to slightly reduce the spring pressure (don't go too far do it a bit at a time) Before this I had noticed fairly deep gouges in my brass caused by the sharp feed lips and high spring pressure adding extra friction.
(the above may be specific to just my magazine)As far as the action goes:I have noticed you really want to make sure that when you push forwards on the bolt you are
not putting upward pressure on the bottom of the bolt knob, this will cause the bolt to tilt forward slightly and want to bind.
It took some getting used to but i just make sure when I push the bolt forward I'm also pressing down and left, its hard to describe what I mean but if you play with the action a bit you will notice that running it with this motion it suddenly smooths out. Also run it like you mean it, it likes it quick and firm haha
It will take some practice but now mine runs great, I sort of like that it has quirks to it. I also find it fun that handing it to a friend leads them to have rough feeding, yet taking it back off them I can run it slick and quickly with no issues.
I just keep in mind the following1. Its a old world gun, old design guns often had to be run in a particular way for them to work correctly, look at any of the millsurps and loads of people have little tips/tricks/tweaks to make them run nice. The counter to this is more money spent on tighter tolerances, but that's not going to be at this price point. My FN Win M70 runs as slick or slicker than any push feed ive played with.... was also twice the price of the CZ
2. The labor that went into making the gun the old world way VS the amount they charge for them is well worth having to "tune" them to run nice in my opinion anyway.
Sorry for the wall of text.