There is no answer to which Losi springs you want to run. That's what's frustrating more than anything. I looked at the KY springs they are running and they are way harder than anything we would normally run.
The numbers don't translate correctly across companies and it's getting old chasing setups because of that.
If you put a gun to my head, orange and yellow will work everywhere. Other springs will feel better at certain times but then 1 run later they will feel worse. orange and yellow are the best balance IMO, but I don't necessarily believe they are the fastest.
I tested this now for the last 2-3 months back and forth and honestly all it has done is slow me down. I would have been faster if I focused on driving the line properly and proper throttle management rather than overthinking what will happen if I put this spring on...