another thing popped out at me when you posted a picture of the label. "made in mexico"..............
almost everyone i have talked to, listened to, and had experience with, those springs [and others, especially the super stock springs] made there had bad comments.
espo springs have always had good comments to my knowledge, so if you are considering them, a +1 or +2 might be a thing to consider. however, all springs will settle a small amount after the install, so keep that in mind.
as i said before, you could always add a leaf [or two] to the spring package you now have from the springs you removed, and all it would cost is a couple of dollars for new center bolts.