The scoring occurs from automatic corpus checks. The best way to help the rule score better is to help with masscheck.it's not corrected, that's the point...
Looking at http://ruleqa.spamassassin.org/?daterev=20140416-r1587834-n&rule=RP_MATCHES_RCVD&srcpath=&g=Change there does appear to be a hamminess to the rule and it justifies a negative score. A score of -1.05 seems appropriate to me.
Regards, KAM
