Mine is running now within a range of 2 seconds a day. Took me however some time to regulate. The lever in the 7750 is extremely sensitive. I am a kind of freak with watches, they not only have to look just like the gen but they also should keep time like a gen (or even better). I hate it when i have a good looking watch but which is 45 seconds off each day (and this is how i got some). Besides a a kind jewelry they are also made as a device for telling the time.
for me the grand carrera could easily be a gen, i treat it like i was, love the look of, and thats why i want it to move like a gen, i will take it to my local watchsmith and ask him to adjust it for me...