You can download a PDF file with Accurate Powder's load data here:
http://www.accuratepowder.com/load-data/
They have data for the .20 Vartarg with A-1680 powder and 32gr. Blitzking and 40gr. V-Max bullets.
My fireforming load is near max with the 32gr. Blitzking and I'm getting about 3700 fps and great accuracy. Looks like you are right near max with the 32-grain and about half way there with the 39-grain bullets, but with less than predicted velocity for both. Could be the powder, could be the rifle.
Are the cases forming OK with the 32s? Shoulders sharp?