At take off weights of more than 140K Gross, tank 6 drains first (known by the pilots as "the doghouse" 12 gallons) and functions as sump and booster pump.
Tanks 1 and 6B drain next from 140K lbs to just under 120K lbs.
Tanks 3, 6A drain next from around 110K lbs down to 100K lbs at which time tanks 1 and 6A are empty.
Transfer pumps begin moving fuel aft at a rapid rate.

Interpretation1: These tanks drain from the outside-in (nose-tail) with the middle/main joining them when they are near empty.
It is unclear if or when tank6 empties. The whole system is working to move CG aft to 25%.
Note: This is where my system is most in error. Between 6-18 K lbs fuel, my system has moved to around 20%.

Process Two:
Tank 3 and 6B continue to drain and just under 100K lbs, 6B empties.
Tank 3 empties shortly after @ 95K lbs.
Aft transfer pump kicks down to low rate.

Interpretation2:
Tanks 3 and 6B are overlapping the 1st group of tanks slightly and go empty about 15K lbs fuel later.
Essentially this is now the center and next-inside from the tail draining together.

At 90K lbs gross weight the plane should be near landing at the 10K lbs fuel load per the current model configuration.
Tank 3 empties.
2,4,5 still have fuel.

Process 3:
Tanks 2 and 5 now start draining after 3 is empty @ 85K lbs.
Tank 4 kicks in just under 80K lbs gross.
Tank 2 goes empty @70K lbs.
Tank 5 goes empty @65K lbs
Tank 4 goes empty last. This tank is located on the engine weight center.