What is the normal spacing for an Ultegra 12-27 10 speed cassette? My shifting was great prior to taking my cassette off to instal a disc cover for a race a couple months ago. After I re-installed the cassette my shifting was quite poor. The shifting is sticky, with shifting up I often shift one time with no change, the next upshift will be a double shift. Downshifts are normal except clunky. I have since taken the cassette and cover on and off a couple times for different races. Shifting has not changed. I had a mechanic at one of the races adjust my rear deralleur which helped a little, but it is already back to crappy.

Did I put the plastic spacers in the wrong order? When I took the cassette off the first time I cleaned all the rings and didn't keep track of the order, thinking that you put the largest on first followed by smallest last, I didn't even think to keep track of the right order for the spacers. I think I put them on right but who knows. Would that make my shifting suck? If so, what is the correct order?

Thanks!