I am also one of those who ended up with a "lemon" barrel.
I bought my DW/22 many years ago (6" barrel) and it never did shoot very accurately. In that same time frame, I also bought the DW/357/4" and the DW/44mag/8", and both of those revolvers shot extremely well. But I could never fall in love with that .22.
Only recently did I learn that there were many of the .22's that left the factory with defective barrels so I assume that I got one of them.
In the mean time, I have also bought the $15/6" stainless barrel direct from CZ but haven't changed it over yet to try it out, and while I was at it, I also bought a new barrel set in 4" for even more fun and to see how accurately the shorter barrel shoots.