suspension questions

Can't say they're the best but the prokit's I got do ok, good ride, I cut a 1.6 60' this past weekend, and it don't wallow too much on the autocross cross.

your stock springs will probably launch better than most lowering springs because they are softer and have more travel, which is good for weight transfer. you can go with eibach drag launch springs, but they wont lower your car by much. maybe only 1/2" also maximum motorsports subs would be good, and you might want to consider some aftermarket upper and lower control arms. they can also help in launching.

Eibach pro kit springs , might be a nice medium, between lowering the car and providing okay weight transfer. they lower your car about 1.5" i think...

I installed eibach sportlines (2" drop) and when i launch my car cant get traction at all. probably the same with H&R super sports.

basically if you want it to launch pretty good, dont lower it too much.

i had pretty good luck with steeda sport springs in my other mustang they were combined with stock shocks.

other good transfer springs would be....mach one and bullit springs with the matching shocks

If you wanted to keep your launch capabilities you would have to buy more than just springs. Such as matching shocks/struts.

I have LT's with H&R Sports and have had no problems scrapping. Nice drop, and looks great. Also got Tokico Shocks/Struts with come MM CC Plates.