"but after 1500 or more miles,mine are now as soft as the stock ones"
While that may be true, think of how much softer the stock springs would have gotten in those 1500 miles.
I have them and like how they lessened bottoming and the lean "push" in the corners. At first I noticed the added stiffness but you soon get used to them. Them getting a little softer may not be a bad thing.
Greg