You have to put the control arm back on to have something to hit. Not sure if you did that. A pickle fork concept will work in that case. Since you already got the control arm off the "big duh" is to use the bolt from the ball joint to pull it out.

Set up with something akin to a donut of steel around the ball joint threades rod, put the arm on with just a few threads make sure it's loose on the top and when you tighten the big bolt, the donut gets tight on the knuckle before the ball stud gets into the control arm. Get that tight and if it doesn't pull out just from tension hit it with a hammer to ring the part it should pop out.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)