the confirmation i think is that we are supporting the same aircraft weight at one G thus lift is unchanged.
Yes, VGs will increase lift to a low speed wing design by delaying separation, but at some point the reduction of air speed of the air that is laminar would result in the reduction of lift.Utility and normal category aircraft typically limit their use to areas fwd of primary flight controls. Air flowing over primary control surfaces during stall is a safety feature to allow the flight controls to remain responsive in a stall.I have seen mods and production runs with VGs all the way down the wing on restricted category aircraft, typically high power to weight ratio (a crop duster is the first type that comes to mind.) My opinion is that they need to bite the bullet and change the chord for their mission. It would be interesting to see pros and cons for the different configurations in flight testing!
Clearly, more power is the answer