New user and question

I am new to Bogofilter. Had been using Spam Assassin for years and wanted to try 
something different as it was not giving the results I wanted anymore. Bogo is 
generally working well. I have no false spam. My problem is I have a fairly high 
unsure count which is 99% spam. I weed out the good ones and send them to 
bogofilter with a -Sn  switch. Then I send the entire remaining unsure to 
bogofilter with the -Ns switch.

My problem is the unsure's are not going down and the majority of them have 
Viagra in the subject. It is not obfuscated in any way.  I see few if any Viagra 
emails in the spam mail.  Am I doing something wrong? I have probably feed 
several hundred or more unsure's like this so far. Is there a way to strongly 
add a word.

Here is my historgram....

Histogram
score   count  pct  histogram
0.00    92645  8.86 #####
0.05     1031  0.10 #
0.10     1311  0.13 #
0.15     1405  0.13 #
0.20      754  0.07 #
0.25      543  0.05 #
0.30     3259  0.31 #
0.35      705  0.07 #
0.40     1010  0.10 #
0.45     2131  0.20 #
0.50     1063  0.10 #
0.55     1628  0.16 #
0.60     1638  0.16 #
0.65     1583  0.15 #
0.70     1588  0.15 #
0.75     1853  0.18 #
0.80     2299  0.22 #
0.85     2865  0.27 #
0.90     3540  0.34 #
0.95   923163 88.26 ################################################
tot   1046014
hapaxes:  ham   60334 ( 5.77%), spam  624305 (59.68%)
   pure:  ham   91447 ( 8.74%), spam  919519 (87.91%)

Here is a sample of my unsure's.......

+ N  67 Oct 25 100% Free Viagra                    (5,954) Fwd: hello
+ N  68 Oct 25 Free Viagra&Cialis                  (5,885) Re: hello
+ N  69 Oct 25 Viagra&Cialis Sample                (5,848) Fwd: Re:
+ N  70 Oct 25 GetFree Viagra                      (5,867) Re: hi
+ N  71 Oct 25 Free Viagra And Cialis              (5,982) Fwd: hi
+ N  72 Oct 25 Viagra&Cialis free                  (5,857) Re: hi!
+ N  73 Oct 25 Viagra&Cialis free                  (5,890) Re: hey
+ N  74 Oct 25 Free Viagra&Cialis                  (5,935) Fwd: business
+ N  75 Oct 25 GetFree Viagra                      (5,925) Fwd: hey
+ N  76 Oct 25 Free ViagraOrCialis                 (5,866) Fwd: private
+ N  77 Oct 25 Free ViagraOrCialis                 (5,983) Re: hello
+ N  78 Oct 25 benefitsfor50plus                    (151K) Enjoy AARP benefits
+ N  79 Oct 25 Free Viagra Sample                  (5,933) Fwd: fifteenth
+ N  80 Oct 25 Viagra Promo                        (5,910) Re: Re:


Any insight would be appreciated.

Doug
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