The -1.1 camber is going to wear inner edge of tire more quickly, even more so when you are carrying a load, as the negative camber increases.
Realize if you've already got a tire that has uneven wear pattern, it may cause pull which can only be fixed by replacing the tire or maybe some careful rotating of tires to cancel that tire's tendencies.
If nothing is bent (your mechanic did check for that?) and there isn't enough play in the strut pinch bolts to get the camber with a few ticks of spec and cross camber with .4, then there are aftermarket cammed pinch bolts for that purpose. I've never had to use them, so can't point you to a source. RockAuto?
There are certainly other "tricks" that can be used, but they aren't something you'd share, here.
