I gave up on rotor-based powder drops for extruded powders. Got a Chargemaster 1500, did the drinking-straw mod, reprogrammed it for speed, and now it spits out exactly the right weight as fast as I can charge a case and seat a bullet.
Forgive me if I repeat something here. The OP's charge variance is only 1.25%, and there are probably a half dozen other factors that vary more than that and are not under a handloader's direct control: case capacity, bullet length/weight variance, scale inaccuracy...
When I started loading it was counterintuitive to me that the powder measure meters on the upstroke, not the down. (I know, silly.) So making sure you lift that handle the same way every time is key.
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