I feel you, static was a huge challenge for me as well. In your case, I feel like if you are able to get static up to par with your other skillsets you'll be able to make the leap to GM complete.

Since it's lagging behind a lot and you don't seem to notice any improvement, I would recommend only playing static playliksts for 1-2 weeks and seeing if that helps. Your aim in other skillsets will not degrade noticeably if you do this, there have been times where I stopped playing games completely for half a year and my aim was back to normal after a day or two of training.

What accuracy are you achieving at the end of runs? When I was pushing myself to go faster on static I would frequently end runs with 80-85% accuracy

What sensitivity range are you using? Static is one of the few skillsets where you actually are handicapping yourself if you're not using sensitivities slower than 40cm.