10 degree 'dead spot' is wear @ the power piston, worm gear, and balls.
Don't mess with your balls and just fix the problem (2020USD)
1 - 04445-60050 - steering box reseal kit - EBAY- $110
2* - 44154-30020 - power piston plunger guide nut - Partsouq - $5 (*2 because I thought just the reseal...