General Anakin nearly impossible

I have been trying to finish the GAK event for weeks now three or four bottles a day and I can’t get past phase 3 I get to the point where I kill everybody except for grievous and then he kills me it’s getting super annoying. why would it be this difficult and I haven’t even got to face for five yet I don’t know what I’m gonna do.

any tips would be very welcomed I have the speed up to 260 or 270 on each character