Your goal should be to get the front axle of the truck the same height/weight as unhitched, not 1/2" higher. Don't bother measuring the rear. It has nothing to do with WDH adjustment. To increase WD tension, fewer links under tension and more rearward angle to the hitch head. I drop the tongue on the ball, latch, use the tongue jack to raise the rear of the TV to at least unhitched height, then snap my WD bars. Sometimes I can do this by hand, but I usually a pipe for leverage. If your jack does not go higher, put a block under it.
TT level to slightly nose down. TV front axle same with WD as unhitched. That's all.