I've had similar situations with the OME stuff.
I got some OME front heavy springs for my fo'do', and the struts of course. I haven't yet put on a bullbar (which is my intention), but my camber was the same as yours /----\. I took it to a few different tire shops to see what they could do to fix it and they were clueless. I already knew about slotting the upper strut mount holes of the bracket, and when i told them this, they were like "Oh, ok, yeah, we can do that". So i said f-it and did it myself. I got a small drill bit in my die grinder and hunched over the damn thing in my lap forever to drill it out wider. it only added about 1/8 of an inch to the hole, but it fixed it. Basically, it maxes out the cast piece that slides into the strut mount, so it actually is pretty much touching the strut now, if you see what i'm saying. My camber wasn't that bad that i couldn't drive it or anything. With brand new bfg muddies, i didn't want early bad wear on them. So i guess i spent a total over 2 afternoons of about 3 hours on it. It took a while to find something to grind the holes with. I destroyed a few drill bits 1/8, but it worked.
It wasn't until after i did all this that i realized that when i put that bullbar on, i'll have to adjust it back probably...
I used original bolts and tightened them down just as hard as i could. They're very tough bolts to start with, and i didn't want to use camber bolts firstly because of the cost, but 2nd, because they break sometimes. The worst that can happen to me now is that the struts wiggle over just a little and the camber is off again, but i don't think it'll be possible to break the bolts. If i do have any more problems with this (i don't think i will have tho), then i'll weld some washers into a fixed position to keep it from moving.