lean forward and keep yo' stance aggressive. make sure you can feel pressure on the tongues of your boots. lead the spin with your head, look in the direction youre spinning, and not down. grabs help too. just concentrate really hard on keeping your arms at your side. i struggled with threes for an incredibly long time, but keeping pressure on the tongues of my boots fixed all my problems, and when i took it to bigger jumps, they were even smoother and easier.