I have done the follower swap for a bunch of my mags, but have not swapped out the springs. The mags ran great in stock configuration. Same for with the magpul followers. Your call.
I do like magpul followers and haven’t had a problem with them. I like the knights armament white followers, they ride smoother inside the mag body than the magpul does.
My friend has a lot of magazines. Said friend has magpuls in every one and never out a spring in any of them. They run like a dog with his balls on fire. Twenty round mags can't be changed but they run fine as is.