I mounted my very heavy and bulky Living Voice Air Scouts and my very heavy and bulky and fragile Apogee Studio Grands on wheels so i can move them around by myself quite easily.I considered that option. But Altec A7 is too heavy to move around and I am afraid of getting scratch on my floor.
Since my wife is away to take care of her ailing mother, I moved Altec A7 myself using cart and elevator in my house .
But I am not willing to move it around in near future.
It sounds pretty good in current position with deep and wide soundstage.
My gut feeling is that it might even sound better in reversed config.
Maybe you could move your Vaughn Cabernet II speakers more easily for a try after you got acquainted enough with them on the current position. That way you can easily judge which position sounds better/best.