Number of rules

[Dennis B. Hopp]

I'm using maia-mailguard with spamassassin 3.2.5.  For the most part  
it seems to be working ok but I feel like too many messages are  
hitting BAYES_00 (roughly 3.7% of all messages) and BAYES_99 is only  
hitting about 1.7%.  I have bayes autolearn on with ham being learned  
at -1.0 and spam learned at 8.0

I'm sort of thinking part of my problem is I just don't have enough  
rules so I'm curious how many rules do other users out there have in  
their spamassassin setup?

I currently have about 2558 rules consiting of stock rules, SOUGHT,  
KHOP, SARE, some customer rules I wrote and various rules I've seen  
posted on this list and other sites.  I have a few plugins enabled as  
well (FreeMail, iXhash, Botnet, ASN, Pyzor, Razor2, DCC)

I know some of it is just training of the bayes but I'm wondering if  
just lack of rules might be causing some of my problems.

Thanks,

--Dennis