Congrats on the new RAMI. That extra width up at the tang really adds to their shootability, I wish CZ still offered that in a steel framed full sized gun.
Sadly my Kadet did not fit. Magwell was to small.
Not quite sure what you mean by this, maybe a photo might help.
The Kadet II slide is too long for the RAMI, so it hangs off the front. Many still function ok that way, just not perfect.
The mag that comes with the Kadet kit is sized like the full size 75 series mags and will stick out beyond the bottom of the mag wells of compact and rami models. Again, many still function ok that way.
Beside those mostly aesthetic issues, are you experiencing other problems?
ETA: In reference to the Kadet II kit. Earlier versions also need the RAMI to have a modified/narrow hammer.