I tried yokmo blue and HPI silver
The yokomo blue spring make the car rolled easy and smooth progressisve feel
HPI silver make the car react quicker and aggressive feel
I think the HPI silver spring are great for med high grip and high speed flow track
In the uk hpi silvers are the only springs to be on.
Our tracks are low grip and bumpy.
If u wish for an alternative to hpi silvers Schumacher greens are basically identical to feel and strength.
The new Durango tc springs will be equivillant too