I took ten days after 3rd year to study for step 2; took CS after 5 days (didn't study specifically for CS) and then took CK after the 10th. I did the exact same on CK as I did on step 1 (pretty well as you would say) and passed CS. Took the rest of the month for vacation. I think you have a great plan. I was VERY glad to get that nonsense over so I could concentrate on sub-I's and then relax for the rest of 4th year! Also, it was much easier since I had just done all the 3rd year rotations, taken shelf exams, etc... I don't remember half that stuff now!
gamma