I too have had problems with the auto disk. Mine used to throw out quite variable charges, and all of them below the stated charge for that powder in that disk.
I finally got it to work consistently, although still below the stated volumes for that disk aperture.
There are a couple of suggestions I can offer based on what some said to me. Firstly, there is simply the case of using the smaller charge then topping up with the missing 0.5gr via a dipper.
After that there is the Lee perfect measure system that I believe is infinitely adjustable, but you may want to check that.
Finally, there is the cheapest and most convenient option: take your .37cc disk aperture, get a needle file and careful ream it out until it delivers the charge you require. The downside, of course, is that that particular aperture is then permanently altered.
I imagine others will follow with more ingenius ideas, but in the meantime.... good luck!
When the right to effective self-defence is denied, that right to self-defence which remains is essentially symbolic.
Freedom: Please enjoy responsibly.
Karma. Another word for revolver: because what goes around, comes around!