I had stock arms with 20s and 2” CST coils/Fox shocks. I think they are more or less the same coil.
The only issue I experienced was the stock arm barely hitting the coil bucket when the suspension would compress then quickly be at full droop. Like when I would go over high profile speed bumps a little too fast. The installer said it wouldn’t be an issue, but I had CST arms put on about 6 months later because the clunk of it hitting bothered me. I guess it’s possible the CST coils are more aggressive because the other poster with RCs didn’t mention experiencing this.
Other than that it was fine and aligned well for the 6 months before I had upper arms put on. I agree with the other poster that coils def stiffen the ride though and it’s not “smooth” like stock. I personally like the way it handles better (tighter) than stock.