The technique of 'running down' wing tanks by retaining centre tank fuel is an effective solution to that, as long as CofG and ZFM issues are addressed and there is enough in the wings to cope with that 10,000,000 to 1 double ctre tank pump failure
The NG has a tendancy to loose CWT pump prime if they aren't used regularly (i.e no fuel in CWT for multiple sectors) and then a relatively small CWT uplift will not self prime the pumps.
If this occurs it can take up to 6K in the CWT to successflly prime the pumps, as such the above is done with an element of risk depending on the initial CWT load. You would need to establish positive CWT pump pressure prior to enacting the above.
BTW is this an apporved procedure??