Hey, I don't know where you're getting these springs but have you checked out this place?
Compression Springs - Custom Springs | Lee Spring
They have a spring on there that matches the stock one very closely (p/n LHC 177N 03M) as well as various others that would fit at reduced spring rates.
I'm still interested if you have any of yours left. The leespring place is kind of pricey for very small orders