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You will want more motor. Speed and torque. Imo.
I had a older stir crazy..black...metal panel on bottom, bigger than smaller red plastic ones.

I riveted a 14W 30 rpm motor to that metal bottom .
Grind sides of motor shaft flat so it fits 1/4 " deep socket. Socket just sticks up into hole in SC. Use bolt for agitator that drops into socket. I drilled bolt for wire, and brazed brass wire to flat washer for agitator arms.....i perfer the drilled bolt.

Then a heavy copper 2" tubing cap $12 from plumbing store dropped over wires....kept agitator weighted down...kept beans away from center where they can be stagnant going in small circle.

2 sets agitator arms one pushed out to side, next swept it back to center. One raked higher up wall to keep beans moving there too.