I believe when you put the bike on 2 scales (front and rear wheel) there is a big weight transfer to the front with .5 trees. Heavier the front, harder to lift.
The scales will show higher numbers for the front once the clamps are swapped. The front will be a little harder to lift by picking up on the front wheel. The front will be easier to lift if you do so by applying torque to the rear axle.
Think of the distance from the front axle to the rear as a cheater bar or other lever. When the bike launches, the torque at the rear wants to lift the front of the bike. Asume the front end assembly weighs 40 lbs. if your goal is to keep the front end down, would you rather push down on the front with the 40 lbs with a realy short lever or would you rather somehow push down with 40 lbs on the front with a 10 ft bar attached to the bike.
It's like a cheater bar on a wrench. The "tightess" of the bolt is similar to the rear wheel torque. Using a short wrench and pushing 40 lbs on it will not budge the tight bolt. Using a 10ft wrench and pushing down with 40 lbs will turn the bolt easier.
Short wrench is moving the front wheel back, Long wrench is leaving it alone.
If you also increase the swingarm length the same amount that you moved the front back, th ebike will be less wheelie prone. That said, it woudl be even better to leave the front wheel alone and make the arm longer.
I am not trying to be bitter guys, I just see alot of people spend money on parts that don't help them just because they see the "pro's" do it. In GSXRDAN's case, the offset should help (since he is moving the wheel back) in others, it is better to spend the money elsewhere.
John