location change (Same employer) after GC

Hi All,

In my GC process, PERM was for location X in Socal.
However, before I could file my I-485, I changed project within same company. Rest of the project members are in location Y, Norcal.
My I-485 was approved Jan 2012 (less than 3 months after filing).
It's been two months now after approval, and I am contemplating moving to Norcal (to be with my team).

I am little confused about location change (same employer) after GC. Some websites say, I still need to be in location X for about 6 months before I change location.

couple of questions:
1.) If I change location and remain with same employer, before 6 months, would it cause any troubles in future?
2.) If my manager writes a letter requesting me to change my location, will that make my location change (before 6 months) case strong?

Appreciate your responses,

Thanks