Hi.
If you have fitted coilovers, you have the advantage (and disadvantage) of fully adjustable ride height. There is so much scope to getting the set up wrong, and a tiny window of getting it right. If its right, and your camber is not adjustable, then your tyres should wear equally as bad as each other.
To set up coil over suspension requires proper equipment. You start by measuring corner weights and ride height, then adjust from there, remembering to keep the vehicles original 'ramp angle' (angle of attack). If you don't keep the ramp angle then your cars aero will suffer. For example, it will be unstable at high speed and worse on fuel economy because of increased drag. The aim is to have equal weight across the front axle, and equal weight across the rear axle, with equal ride heights across the front axle and equal ride heights across the rear axle, again while keeping the ramp angle. It is very tricky to get it right, even with the right equipment.
I suggest, taking it to a race team who do these specific set up's. they may laugh at you, but tell the boss your willing to pay money and they will do it.
However, with your camber non adjustable, you will still suffer with tyres wearing the inside edge.
Hope this hasn't killed the coilover community.