Doubt if mods caused the problem.
- nope, dont know fords.
- caused by camber, cos you've lowered it. BM 3series suffers really badly here, as does Mk3 cav with rear IRS ( any 4x4, and the 2wd GSi ). Only thing you can do is swap front to back regularly. There is a Oz based company called Kmac that sells bushes that allow you to correct the camber, but they are more trouble than they are worth.