Honestly i didn't really pay attention to the steering speed or torque before, until I went to this track and saw an sc taking very tight turns like nothing, and the guy driving it told me to replace my stock servo for a "good one" (expensive one) and then I started wondering.
So, stock Traxxas 2075 digital servo:
Torque: 125 oz-in
Speed: 0.16 sec @ 60°
and Savox 1258 :
Speed @ 6.0V: 0.08 sec/60°
Torque @ 6.0V: 166 oz-in / 12 kg-cm

Is that a huge difference?
And the questions:
1. The difference between the two of them would be really noticeable?;
2. Is it going to improve the handling of my steering?;
3. The truck would be able to take sharp curves easier?

Or.... 4. Is just the driver who needs more practice?