On high grip (carpet/astro) high load, the saver slips when you turn in which means initla understeer then as you slow down (and loads reduce) if jumps to where it should be means unpredicatle oversteer. The HD spring is better than the stock on but you can still feel it on certain tracks.
I too use an alloy replacement arm, plastic saver gear in KO servo but never a hybrid or all metal gear servo, I do try not to crash much though
