The rear of a TV will squat more then the front due to the fact that the TT's tongue weight load is placed close to the TV's rear axle (on the hitch ball). The WDH's main design function is to address weight changes that take place at the TV's front suspension, not the rear. Through proper WDH adjustment the objective is to return the same weight removed from the TV's front axle back to it, thus returning the TV's front suspension's steering/braking characteristics back to the TV's unhitched condition.
Once a WDH is properly adjusted there will be "some" relief of the TV's initial rear squat, but it's normal to see a 1" to 2" rear TV squat after a proper WDH adjustment. It should be noted that different TV suspensions react differently to a WDH adjustment. For example, with my 2500HD truck a 1/4" front suspension rise can represent almost a couple hundred pounds (confirmed at the CAT scale). Also, just the settling of the TV suspension can throw off the results of the TV fender-well measuring process.
Experiencing a 1/2" front suspension rise under your present WDH adjustment can still represent a lack of adequate weight return, it depends on your particular TV suspension. I would adjust your WDH such that your front suspension fender-well height is as close to it's 'unhitched' height as possible (but not lower). Your TV's final rear suspension squat will be a by-product of the final WDH adjustment (is-what-it-is)
It sounds like you have the Equal-i-zer WDH, I'm sure some JOF members with that particular WDH will chime in with some detailed adjustment guidance. In principle to transfer additional weight to the TV's front suspension one would want to tilt the WDH ball mount a little more toward the TT via proper spacer placement. Also, the Equal-i-zer spring bars should be adjusted such that they are parallel to the TT's A-frame once engaged (bars square with L-brackets).
The best way to confirm any WDH adjustment is a visit to your local CAT scale under loaded TV/TT conditions.
CAT scale how-to: http://www.jaycoowners.com/forums/f3...v-tt-3871.html
Hope this helps.