My green and white cubes from puzzleproz are my best cubes, better than the 3 black cubes I got from Rubiks.com. I hardly pop with my puzzleproz, and I do not have them set tightest. I have popping problems with any cube if it is too loose. The center caps seemed to be the deciding factor in my favorites. I got an order of 9 puzzles from puzzleproz in 3.5 days from Hawaii to Massachusetts. Also, he helped me in his forum, when I needed to adjust my 4x4 Eastsheen tension.
I admit that I have had problems getting cubes lubed well. I finally decided that "cube lube" is not as good as 100% silicone. Recently I replaced my "ACE Pure Silicone Lubricant" (from ACE Hardware) with "CRC Heavy Duty Silicone", and I think I have better movement when my cube is tightened enough to prevent pops. Unfortunately, my Rubiks.com cubes have messed up center caps, so it is tough to redo them (with tension) so they are on the loose side and therefore pop.