As others have mentioned, the trailing arms on these cars won't cause your problems. Honda trailing arms have big squishy rubber bushings in them, the Boxster have a hard nylon bushings, so there is very little deflection. When worn, the Boxster trailing arm bushings make a lot of noise, but they typically don't affect the alignment to suffer.
I'd say rebuild your suspension before trying something like a rear sway bar. Maytag is right, until you get repeatable results, you will just end up wasting time and money.
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