I have had good luck with the red springs also.
You are correct the CK feel very responsive with these springs.
TQ,d and won the A main in Sundays club race--about 12 cars,
The knife felt good and gave me my first A mainin a long time.
Seems some of the young drivers don't think much of a 50 something old man lapping them.
I have paid my dues and am enjoying having a car that is so
responsive and yet forgining.