Now that I think about it, I am glad I didn't do any videos. The tire grooving debate is practically an institution on TBN. Who would I be to put a stop to it?
Setting "science", "variables", "objectivity", and "proof" aside (who needs 'em anyway?), I think I'll be able to tell very easily if I have achieved any improvement. First, I plow sometimes for my neighbor. Even with a small amount of snow she has an area that I can't plow going up hill. If I can pull the blade while going up after grooving my tires, that'll be an improvement. Also, my usual plowing method, which is also the most fun, is to plow to the end of my drive, then turn around in the road and come back the other way. I am usually plowing in high range (reverse is too slow in medium) at full throtte. To make my U-turn, I crank the wheel and stomp the go pedal. The result is that the chains on my front tires bite while my rears spin and I do an awesome power slide. So, what I'm getting at is that I'm pretty familiar with the slippiness versus traction characteristics of this machine. I regularly experience a situation where better traction will be noticed.
As I said earlier, I'll keep y'all posted.