If everything is working fine. Then leave well enough alone. A Kidd bolt, which is prolly the best , isnt going to tighten up your groups , if you dont have a benz cut chamber.
if you are having extraction problems , get a VQ extractor, or other EDM cut one,
If you are having flyer problems stake the firing pin. This prolly wont fix it, but at least you tried.
As for radiusing the rear end of the bolt, That will let yuo use a heavier return spring and that might keep your bolt closed a nano second longer , which might make things better.
If you want it all to run slicker, then you can polish it up, and scotch brite the inside of the receiver, or just use Hornady One Shot Dri lube .
The things that will let you and your gun shoot tighter groups , imho are in the following order.
1. Better Ammo. Yeah the $15 a box ammo shoots better.
2. Better Barrel, Yeah a Benz type shorter Chamber shoots better.
3. Better Trigger . Yeah a trigger light enough to pinch fire will cut back on the yips.
4. Better Stock, Bedding. Yeah a secure , stable , platform for the action is always better.
Imho, a bolt is just bling, unless its sitting in an integrally designed barreled action where its improved attributes will add to the overall performance.
That being said, I have a bunch of JWH bolts, but that was because I was doing builds , and so I needed bolts and charging handles, and they were cheap enough $40 or less, that they went into the stripped receivers, just like the custom barrels and triggers. And while they are all fine or great shooters, none of them are quite as good as a Complete Kidd Build .
So if your gonna buy a Kidd bolt, then buy the rest of the parts too. They work great together.