No I haven't. Spring rates shouldn't affect height, unless you're weighing your car down with sand bags or something haha

; )

A friend of mine got the newly redesigned stances with 10k springs all around and re-valved in the rear and they did not go near slammed in the rear he ended up cutting the lower mount and re-welding it to go an inch lower and it still needs about a 1/2 an inch imo , and stance dont make a 5 inch spring whitch is what you would need to slam them in the rear(front has tons of adjust-ability)