Caster & Camber VS Height

If you adjust with 1/2* less camber on the left, it will pull to the left on modern roads. Used to be the roads were crowned a lot more than they are now. I would adjust caster evenly.

You might get a little more camber raising the ride height. Trying to "adjust" caster with the front ride height is futile. Lowering the car from the rear however, would have much more of an effect, but I don't recommend either, unless you have air shocks in the rear that are pumped all the way up.

You probably hit the nail on the head with the mechanics not know how to do it. All they are used to now are cars where they can "set the toe and let it go" and most still don't get that right.