Tinribs. the wing design and low level fatigue actually were not the root cause of the problem. The problem was one of metallurgy. The alloy was found to form crystalline structure when formed and spars in store were found to be similarly fatigued. From Wiki "premature fatiguing and inter-crystalline corrosion traced to the use of an inappropriate type of aluminium alloy".
There had been one or two Valiants at Pershore with only double digit hours and they had hoped to give them a limited clearance. They checked a few rivets and found no problems. They were about to give them clearance when they checked one more rivet for luck . . .
As for the wing shape I believe the Mark 2 had the same shape. "the "Black Bomber". Its performance at low level was superior to that of the B.1 (or any other V-bomber), with the aircraft being cleared to 580 mph (930 km/h) at low level (with speeds of up to 640 mph (1,030 km/h) being reached in testing). " I don't know about the metal used on the Mk 2.