on my 190E, I pulled the lower control arms off and put 'em on my 12 ton press to get the buggers out. It took some extra wrenching and a good wrestling with the coil springs, but it went ok. It was a lot of work , as I didnt have the 'right' tool.

A better-quality ball joint remover , like the c-clamp one you were using, sounds like the best way to go in terms of time, sweat, and safety.

Just my humble opinion,

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Patrick Leber
'84 190E 2.3
'83 Porsche 944 (track car)
'84 Porsche 944 (parts car)
85.5 Porsche 944 (sled)