The servo saver is a problem on high grip tracks. I noticed this when i ran on an astro track. Since you said you run on grass and carpet, I'm guessing using a fixed servo arm will propably solve a lot of the discribed problems. I tied a zip tie around the stock servo saver and the car felt noticably more solid in high speed turns. Try this. It's a small and fast fix and check if this solves your problems.
untill now, I used a front diff, mainly because my front oneway hadn't arrived yet. A front oneway will generally make the car steer sharper.
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