The 7750 is a great movement, it's just thick. I have a Daytona rep with sec hand @ 6. It works fine and checks out in the time grapher. It just needs to be clean to start with, big problem in the Chinese factories, a lubricated properly, not too much and not too little. Daytona reps are hard to get a good mix using ETA movements in general. The seconds at 6 or 12 require gears involved that were not meant to be there. Keep them off a watch winder and make sure they are service by a knowledgeable watchmaker/watchsmith. They do look nice on the wrist though.