Why should the wings stall? Has there been any confirmation that flaps were retracted? Does this model have leading edge slats? Presumably there would have been TOCW warnings if the flaps were inadvertently not extended when they should have been.
There has been so much hang-up on the supposed 'left engine fire/failure' and this defect that they returned to stand for that the wood is not being seen for the trees, and I just cannot wade through 44 pages of amateur conjecture. The description of the aeroplane behaviour from what I can pick up bears similarity to previous inadvertent flapless take-offs and those tragic flights with iced wings that are just unable to maintain flight. The alleged vibration/wing rocking says stall as you said.