I looked at the temps on the day and they were within 5 deg of ISA.
Vmca increases with temperature decreasing. It also increases when you put the gear up.
The book Vmca's are only valid in the TO configuration. After you get the gear up V2 is meant to keep you safe and then Vyse once clean. But if you stray away from the book configurations and limitations ie use more than 5 deg of bank engine not feathered you don't have a clue what the Vmca is.
Which is another issue I have with some of these noise abatement procedures requiring sometimes a 90 deg + turn left or right before the acceleration phase.
25-30 deg bank angle at 1000ft and the inside engine goes and your a smoking hole in the ground even with the auto feather or NTS working at V2 +10