Was it concluded they would have survived if they maintained speed?
P47 of the
NTSB Report is relevant.
I flew for an outfit that taught ET's were flown at V2.
While that can be the case it is more general to predicate turns on a speed range. All depends on what the ops engineers do .. the procedure should specify the story for the line troops.
Boeing state that the performance at V2 - V2+15 is the same
Can't say that I've seen that .. do you have a reference ?