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2" at the rear seems like a lot of lower and i would suspect rear bump steer is contributing to your instability. (when you get low like that the rear toe control arm - or tie rods if talking the front of the car - are at a funny angle relative to the wheel carrier and bumps in the road cause changes in the toe which make the car dart around - toe control arms/tie rods with spacers allow you to get them level in a lowered car so that the geometry is correct and the dynamic alignment doesn't go wonky).
further, when you get that low the LCAs (coffin arms) go past horizontal and when you compress your suspension (ie in a turn) your camber actually decreases.
i think your thoughts are correct; better coilovers with less lower, and if necessary some adjustable rear toe control arms that also allow you to adjust for bump steer. honestly, i'm amazed that they were able to get your rear toe in spec with oem toe control arms and a 2" lower. in the interim perhaps soften your rear bar as much as possible to allow the rear to roll into all that camber you have.
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