The purple spring you have is 8 coils. The one I have that has 8 coils was made with .035" diameter wire. The other one I have was made with .032" diameter wire and has 9 coils so you probably have the stronger one.
Instructions with the kit confirmed the advance adjustment available is 28* max.
I think if you start with it adjusted around 24 to 25* that would be good.
