There is a lot of info out there. Chasing spam is tedious.
I find adding this header to be helpful
Here is a full list under TEMPLATE TAGS
Adds a header that shows what rules are triggered with their score.
Non spam example:
Spam caught showing weighted rules:
To weight existing rules first see what is being triggered in X-Spam-Status, copy the rule exactly and change its value in Header and Body tests.
I have better luck if I keep the triggers short. i in the next column makes the trigger not case sensitive