Originally Posted by
vredstein
I find that adjusting the high limit screw so the derailleur rests a couple a mm or two just outside the center of the small cog, then using the derailleurs cable adjuster to add a bit of tension works better than setting the limit screw to the absolute center of the small cog.
Nice tip, but some shifters allow extra slack for the last cog, so I'd advise checking it doesn't allow the RD to move too far.