I have had almost all of these issues. It is the price of admission for a 6263. My watch was serviced and runs great. I found that the chrono will not function properly if the case back is over tightened. I also found that the chronograph stops at 5 seconds after the hour, but this does happen if the watch is wound well. Has anyone found this out with 7750s? Fully wound the chrono runs perfect.
I need to reset my chrono hand because I had some slippage. I guess I should not have reset it at 20 past the hour. My watch runs and looks great!