There are so many different factors that could cause this problem. First of all there should be no positive toe at all, this is the (or one of the) cause of the unstable driving conditions. There may also be a "bump-steer" problem since the car is lowered. Lowering the car will change the angle of the tie rods/ends and cause this also. I see you have modified your sway bar to all the correct caster. There are only three settings for the front alignment and that is caster, camber, and toe. It is best to get these as close to factory as possible (after lowering) with the exception of the camber that a slight negative is okay. Now with all that said the other factors that could be of concern here are the condition of the bushings, wheel bearings, ball joints, tie rod ends, steering damper, idler arm, and steering box. All of these things could contribute to these problems. My suggestion is to first check the condition of these items and then have a correct computer alignment done by a professional. After that drive the car and see where you are at that time with these problems.