Re: x coupe suspension
I can give you lots of ideas to make your coupe handle, which includes lowering but I'm not sure if that's a priority with you. Obviously you should start with the springs, front coils need replacing, go with manufacturers recommendations and pick your ride height. Rear leaf springs can either be reset (bent) and usually an extra leaf added to stiffen the spring to avoid bottoming out. The other option which I prefer is to buy another set of springs outwright buy a mob such as Kings Springs.
Hope this helps somewhat.