Im not sure, from what I have heard over the years cutting the stockers means a rough ride for sure, but how rough I dont know. If you plan on getting springs anyway it seems like a lot of extra work since your getting aftermarket ones in a bit anyway.
I know alot of guys who cut the stock springs. The problem is people cut too much out and the is what causes the rough ride...which gets rougher then stock with any lower spring you add. If you just cut like a 1/2 coil from each end of each spring you will get about an inch lower and not destroy the ride much.
That said i wouldn't fuss with cutting springs, if your gonna go through the trouble og removing them just get new ones.
Thats stupid! You will have it apart to install springs so you might as well do the shocks and struts...Makes no sense to take it all apart again.
You probably won't even need CC plates with the H&R's...my stock CC's align my car up perfectly.