[rpmerf]

Next thought. I've found the best way is the 2 person method.
Person 1 - Start pushing the pedal down
Person 2 - Open the bleeder
Person 1 - Push the pedal about 80% of the way down, then stop and hold
Person 2 - close bleeder
Person 1 - release

Repeat.

If you are using a vacuum bleeder, they tend to suck air from around the threads. Wrap the threads of the bleeder in teflon tape. Make sure you use a good connector on the bleeder.

Some prop valves do not like when there is an imbalance, and need to be reset. Make sure there is good flow everywhere. If not, you either need to reset the pro valve, or look for another issue.