I use the same set-up but have not experienced the variances you are seeing using the same disk hole. I recall the rubber seal on the bottom of my measure was real tight as well at first. Assuming you have it facing the right direction as mentioned above, it may just need some breaking in. You can aid this a bit with some powdered graphite. Work it in with your hands on the top of the disk and the rubber seal on the bottom of the measure. Put some powder in the measure and just throw a bunch of powder charges dumping each back into the hopper as you go. Don't bother weighing them till you have done a bunch, maybe 50 or so, then weigh a few and see if there is improvement. Good luck.
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