How do I make my Zhanchi smoother?

Lube the core properly, there is a tutorial of crazybadcuber out there that tells you exactly how. Don't take out the washers, that will not help anything.
 
That's cool. As long as the end of the spring doesn't get caught in the plastic.

I wonder what the inside of one of your center pieces looks like, just out of curiosity, without the lube and all, just to see it's current state and if any grinding of the spring has occurred in there.
 
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