You don’t need a special bearing.
You should work on your throw. If the yoyo is tipping slightly and the string is rubbing on the shell adjust your throw. First just observe the yoyo when you do a simple throwdown. If the body tends to tip one way, twist your wrist slightly the opposite direction. Repeat and adjust as needed. Then repeat the same with a sideways throw a few times. When that works to your satisfaction move on to the trapeze.
Then when you move on to other mounts and tricks practice keeping hands and string in the same plane. Meaning both hands aligned with the string and the yoyo as if it were all taking place in a pane of glass.
Double or nothing - work on landing the yoyo as close to your finger as possible. Part of double or nothing is hand spacing. That is highly dependent on string length and is a trial an error process to get it right.