Lower Mondeo Tournament?

Hello, I gave us half a year ago for my family a Ford Mondeo TDCI tournament Bj 2003! Most of the time my wife drives it. Actually she is quite satisfied with it. But she doesn’t like the somewhat “smoky” driving behavior. He would shunk too badly. Now I wanted to ask here if someone with lowering springs knows, or maybe even has installed some. What experiences have been made? Which brand is to recommend? How much should you lower the car, so that there is still enough comfort? etc. etc. Many thanks in advance. Many greetings Sveenie.c