Hey Jose,
I have never put finished spirit through a centrifuge, but here is how we dealt with clarifying spirits at my last distillery-
1. Agar agar fining agent, let is sit and let the solids settle over the course of a couple of days, preferably in a cold environment
2. Rack off the clarified spirit, being careful not to disturb the bottom
3. Filter as slow as you can, through nothing bigger than 20 micron. Depending on the spirit, we would go down to 1 micron, or carbon.
It is a little labor intensive, but that was how we got the best results with our amari and other liqueurs.