In an attempt to improve my cube, I sanded down the contacting sides of my cubelets. However now when I turn my cube it feels very GRITTY (despite the lube) and takes a lot of effort to turn; what should i do!!
The surface should no longer look shiny after you've sanded it but it should be smooth. There shouldn't be any cuts into it that are half a millimeter deep...
That might be normal. After I sanded and lubed my cube it wasn't as "smooth" as it first was but it turns more easily and doesn't jam. Before it couldn't cut corners and would jam frequently.
I prefer a little more friction over something that can't cut corners.