Graybeard
Automatic fuel transfer normally starts at FL 255 in the climb and FL 245 in the descent. The CG position is monitored continously and fuel transferred to give optimum CG for best fuel economy.
However, you don't get something for nothing. At 205 tonnes, compared with 29%, a CG of 37% will give a reduced Buffet Margin of more than Mach 0.02.
Fuel can be transferred forward at any time by the pilots using a switch on the fuel panel.