You're getting +/- .25 grains with Unique and are complaining? Some measures don't do that well with it. Their owners would call that a miracle and give up the search for better right there. Big flakes are notorious for inconsistent metering, and Unique is the king of difficult in that regard.
If you want to try baffling, I have templates and instructions for making baffles free for the downloading in PDF format at my file repository,
here.