I think once the pan is warped the best and least painful solution is to just buy a new pan. They can be had for $60-70 toss in a filter and gasket kit and you should be under $100 surely cheaper than to keep feeding it ATF and having to deal with it repeatedly.

Been there and done that on two 300SD's. I hate pan gaskets.

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82 300SD 145k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
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93 300E 195k