I'm having a problem getting the proper negative camber on my front tires. For the longest time I have experienced wear on the insides of my front tires even after having it lined up at a sears shop for about $80. My tires lean like / with top in bottom out I want to get some negative camber to make the top out bottom in. After much reading I think there are 2 places to adjust camber and toe. It seems if I adjust the camber at place where I have attached picture it throws my toe ot of wack and if I get it pretty close when wheels are off the ground with no load on them when I set the car down I do not have my proper camber any longer. It seems like a dumb place to be adjusting camber as where it attaches to wheel is in kind of the middle and I thought it would be better attaching more to the top or bottom of the wheel . Does the adjustment have to be done with weight on the wheels not possible with weight off? Just trying to get away from this uneven tire wear I have. Where I have been trying to adjust camber is in attached picture.

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Normally alignment adjustments are done with vehicle loading on the wheels. My suspicion is you would be totally lost otherwise. Also it does impact the toe setting as well.