The 15k Kyosho was something I always ran on my cars and I switched to it at the race for the first time on the SM car. If you hit a kingpin hard/fast the Green Spooge tends to sheer and not give much "hard bump" dampening. The Kyosho is a little lighter but still gives good dampening in this situation. For bumpier tracks like this, it seemed to help out a bit but in most cases, the Green Spooge works really well.