Your camber can be adjusted. If the guy means that he's maxed out the front adjusters and the camber cannot be reduced any further than the -1.5 degrees, look at your caster (not camber) adjustment. Moving the rear adjusters so that the wheels move forward (more positive caster) also affects your camber and makes it more positive. I had a -1.5 degree camber with the front adjuster maxed out, by leaving the front adjuster there, then maxing out the caster by moving the rear adjuster in a positive direction (wheel moves forward), the camber reduced to -0.7 degrees (about half the negative tilt you're seeing now). Hope that helps / made sense
Regards
Gary