spamassassin doing bad job filtering out spam

[alex]

I even lowered the required hits to 4.0 from 5.0. 

for example, the latest batch of spams with "your resume" in the
subject:

X-Spam-Status: No, score=0.3 required=4.0 tests=BAYES_50,FORGED_RCVD_HELO,
        HTML_FONT_LOW_CONTRAST,HTML_MESSAGE,MIME_HTML_ONLY autolearn=no
        version=3.1.3

and that's after using spamassassin -r on previous "your resume" spams.

Any ideas?