Lastly unless you send your SG to load control every sector they will be using a standard SG for weight and balance calculations
So what difference does it make to weight and balance if you go from one high SG to one low SG?
The fuel is loaded in kgs, so the weight is always the same.
Yes with a high SG you will get less fuel in the wings, and more in the centre, byr does that really make a difference worth worrying about?