Question About Dillon Powder Measure

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Kind of mentioned this in another thread, but have a direct question for the more knowledgeable members:

I am loading on a Dillon RL550 using 4.7 Titegroup Powder.

I've noticed variations in thrown powder charges based on variations in the speed and smoothness with which I operate the loader. Never more than .2gr, but it is unusual for me to dump more than 6 or 7 charges without having one come up light or heavy .1gr, usually heavy.

I'm using the same case to check these charges.

What is the usual margin of error +/- on these slider bar powder measures?

Is their a better metering powder that might reduce this variation? Based on my reading, I'd be open to trying either WSF or AA#2 if they meter much better than Titegroup.

Any suggestions?

ETA: I've worked up to 5.0 with no signs of over pressure, so at 4.7 I'm not worried about the variation causing a kaboom.