What kind of lanthenated tungsten? 1.5% 2%? I’m using an everlast powertig 315lx. Thanks for the feedback!

I’ve been welding for about 7 years, self employed for 8 months, and im having trouble fingering this out. When tig welding thick aluminum (200+ amps) my tungsten quivers like crazy. It balls up like normal then droops down and jumps around. Usually happens when I’m welding for a long period of time...