Good but not the best spyderco - Spyderco Sage 6 3in Folding Knife

I had really high hopes for the Sage 6. I have a Manix 2, PM2 and a Smock. They all have great action. Everyone of them flicks right open and drops shut with zero issues. Because the others were so spot, I thought that the 6 with a combination of the all of them would really win me over as my next EDC but truly cannot get the action dialed in like the others. I've taken it apart several times. Did a deep cleaning, gently polished the washers with non abrasive cleaner. Lubed it up put it back together and it was just slightly better. Second time around I decided to remove the upper detent ball. Again, slightly better. First time I've been disappointed with a Spyde.