There are a number of things that can cause the problem you are having including but not limited to too much oil or grease used in the supposed CLA, misalignment of components during reassembly, the face plate being pushed in slightly after being bumped in shipping, or the shutter was not cleaned as stated but looking at the shutter diagram the most likely cause is the retainer ring being over tightened.

The lens is in a Synchro Compur shutter, shows the 90mm f8 in shutter breakdown CN1110-000 which is the first shutter in Section 4, you have to use the 3rd button from the left to step through the pages. Remove lock screw 538, turn retainer ring 547 counterclockwise (anticlockwise) until the next screw hole on the face plate 540 lines up with the retainer ring then reinstall lock screw 538 and test the shutter. There are 3 screw indentations on the retainer ring, any one of them can be the next screw hole in alignment. Check the shutter at the 1 second setting. The speed should be correct without the speed dial having excessive play or too easy to turn.