Not all airlines carry those loading charts anymore in flight deck...
- so what are they going to do if they divert to a non-company station - wait for mummy to come along and help?
A 5t deadweight in centre tank results in a movement forward of ~7% MAC.
- no it does not. That weight is already there.
Using 2t from wing tanks results in a forward movement of ~2% MAC.
- thus we are talking -2% MAC? Hardly earth-shattering, I suggest.
EDIT: "~7% MAC." Are you confusing trim index units with %MAC?