I also purchased a CW45 somewhat on impulse as well. First time at the range I had no problems with shooting 200 rounds of Sellier and Bellot 230gr. However, You must be a far better shooter than me because I did not get the accuracy that you achieved. I was shooting from ~40 feet and couldn't do much better than keeping shots inside an 8" circle. It could have been because the pistol was new, and this was the break-in period.
I did not like the sights that came with at, and yesterday I changed them for the Trijicon night sights, sold on their web site. I am going to the range today to check them out today (if the weather clears), and I'll let you know if I can do better today.