I have had 2 nad OOb finish the balls just seemed inconsistent, One time it would recover from the corners , next time it wouldnt..
I decided to try some more surface adjustments. I had it sanded down to 1000 and then polished back to like a mirrow... still no good.
1 more try, I sanded it down to 400 and then polished .. Now i got what i was looking for. The ball still clears the front great and turns the corner like never before. Even if i pull it in the oil it will still bend enough to finish.
I throw the ball pretty hard 19-20 mph and a good amount of revs. So if any of you are thinking about sanding with 400 , I SAY DO IT.. You will not be dispointed... Besides you can always bring it back to 1000 or 2000