How are you connecting the bleeder? I now use pressure via a pressure bleeder connected to a spare master cylinder cap.

I simply connect, pump up the pressure, open the bleed valve and pull the trigger.

My alternate method is the old have a helper pump the brake pedal and hold while I open the valve. This has worked for years on multiple vehicles and was taught by my father in law almost 50 years ago.

Pressure bleeding is easier and you don't need a helper. You can even set the level in the master cylinder by having the tube extend into the master cylinder to the height you want. Release the pressure and the bleeder will siphon back into the main container and stop when fluid is even with the end of the tube.