7.25 pinion seal replacement questions can't get the pinion nut off

I know, I read a few places to tighten a few degrees more. I just could not get it to move anymore with the tools I had. The only way I can see to make it tighter is to use a more powerful impact wrench. I was using jack stands. I had the tires about 8 inches off the ground. There was too much flex in the breaker bar setup and I could not get enough torque that close to the ground. Using a breaker bar might work better with the car on a lift.