Discovered late in flight testing????
As a total outsider (apart from some jet engine design many moons ago), I would have thought that the design process would have gone something like:-
What a pity we cant fit these larger engines to the 737.
But we could if you moved them forward and up.
That's a crazy suggestion, it would totally destabilise the aeroplane.
Yes, I know that, but you can fly an unstable aeroplane if you have computer assist, the military do it all the time, and we already have plenty of computing power in the system.
True, that would work, and we can't see any other quick solution. We'll have to go that way.
Just speculation!!