Hi James,
Have you put the car on a flat concrete floor, & measured the camber that has resulted from the lowering ?
Even if you don't have one of those little electronic inclinometers; with a straight- edge across the rim edges, in a vertical plane, with a spirit level, you should get a good idea.
If you take Colin's advice, & get a wheel alignment, the camber & caster angles will be measured, as part of that service, & will be noted on your report.
What are all the rubber bushes, ball joints, & steering pivot bushes like on the front end ?
The McPherson strut design was cheap to manufacture, but does have some nasty results, if everything is not just right. Gets even nastier, if you start changing the geometry dramatically.
Cheers
Banjo