Torsion Bar Lift

[xrtdx8]

I have a 98 Jimmy, I want to lift the suspension up a little bit, cause i always bottom out the front end when i go off-roading. I was thinking about just going with torsion bar adjusters for the front, and then fliping the rear axle. That all should give me about 2"-3" of lift and then i would go with larger tires.
I wanted to know if the torsion bar adjusters are actually worth it, and also if it would be putting more tension on the torsion bars or would it be pretty much the same as the stock tension?
Here's a site that has the torsion bar adjusters on it http://www.tsliftkits.com/