Yeah, you can use up to three springs (small, medium, and large diameter) in any combination, but you can't use two of the same diameter. My kit came with 2 springs of each diameter.
When I put together my spring chart, I took this into account. There were two options for the 17.4 springs and I think there were 3 options for the 15.95 setting.
Some of the other duplicates, if memory serves, were well below or above what is likely to be your required set point.
I also considered a manual boost controller early on, but Brad was able to dial it in with the tune.
Sent from my iPhone using Tapatalk