If my memory is correct after 30 years I recall that the B707 used to have a performance decrement applied in strong crosswinds (15 kts + I think) which was to compensate for the spoiler drag.
Nothing wrong with your memory, quite correct, about the B707.
Adding large amounts of aileron early in the takeoff roll degrades takeoff performance, so add the aileron (for crosswinds) only as needed, and delay rotation slightly, for added control margin
Slightly extra speed in these situations, is your friend.
In fact, this (added speed) procedure is used for improved climb performance, where excess runway is available.
Pretty standard stuff with many Boeing (and Lockheed) jet aircraft.