Melissa shook her head to that request as “your tuning of the piano turned Brahms Wiegenlied into a bass song, so I'd rather not have your help.”
this sentence should not trigger the your vs you're rule. (I think you should test for VERB + 'of')
I could not correct this problem. Refer to the new examples in the first rule in rulegroup id="YOUR" (https://github.com/languagetool-org/languagetool/commit/ded5d77cfe956030c29c874d40a7ed939036e446).