to get a good bleed, get some tubing and a bottle, fill the bottle with brake fluid or even water a bit, connect the tubing to the bleed nipple and make sure the tube is all the way down in the bottle.

hang the setup in a way that the bottle is above the slave cylinder but still below the master cylinder level. This way the liquid in the bottle acts as a one way valve and air cannot be pulled back either.

I have bled numerous systems like this and all have performed great.

dont overstroke the cylinder, gentle tiny strokes to prime the system and then only half pedal strokes to bleed it.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)