The simple quick answer: if lubing it solves the issue, lube it. It's a $40 knife. These aren't full on bearing works with dedicated race washers and the whole get up. They're a simple ceramic cage ring with a single orbital, they run against the knife steel and the liner steel.
The longer and more involved answer: the liner steel on this knife is soft enough that if you've run it with a tight pivot for a long time it is conceivable that you've worn those races so deep that you have bottomed out, or are starting to. Bearing steel is MUCH harder than either the knife steel or the liner steel, and just from some light flipping my Scimitar already has well worn bearing races in the liners. And barely visible ones in the knife steel -- just from the light use. If there's a grating sensation when you try to flip the knife, this might be your culprit.
If you've got that issue, then disassemble your knife, get the liners, get a piece of wet or dry 600 grit sandpaper, wet it with water or some cleanser, and lightly but evenly sand that part of the metal. You're less filing it away and more smoothing it down. You won't sand it down to the point where the ring from the bearings is gone - nor should you - but you do want to sand it down to a point that the bearings are fully back in contact with the bottom of the raceway and there's an airgap between the frame and blade again. You don't particularly want to breathe fine steel particles, which is why you wet sanded even though it's messier at first -- make sure you wipe everything up carefully.
If you put your knife back together it should be fine. Just don't tighten the pivot down as hard as you have been.
For the record: most folks I know aren't afraid to put a little lube on bearings, even ceramic. Some are very sparing with it because they take their knife into very dirty environments, and having a bunch of extra lube in your works just means that you have extra cleaning to do (and increased wear and tear on the fastenings and connectors as you disassemble and reassemble, over time). Lube is one of those thing where people often think more is better, and it isn't. But you aren't going to damage your knife by lubing it unless, like, you live at the edge of the desert or someplace where a lot of dust blows in the wind. It sounds silly to say it, but dust is a much bigger problem for knives than dirt is. Think of sand getting into your swimsuit - that's dust and knives. The same principle extends to anything with small mechanical joints -- ask the US military how many billion dollars of equipment they have lost to dust fouling. If you live with a lot of dust, washer knives will wear a lot better than bearings will.