i think google crawls your site whether you have too many or just few links
google crawls by decending pR (backlink number and inmportance)
to if you have like 10000 links do you think google wont index you ?
I think something new you can try but within that you need to continue your work as SEO is a very continuous and long process. For example, if your site is indexed with 1 Press release, then you will not do it again through making the unique content of the same keyword on same site.
Like people clicking on adsense to kill their competitors.
Google is idiot and unhonest not to create a system which prevent crooks from abusing honest webmasters because crooks serve Google though they pretend to do everything to make their system honest they do not do the BEST things.
There are techniques called SPC (Statistical Process Control) which are well known in Industries (I’ve been a statistical quality engineer so I know what I’m talking about) which can be used to detect cheaters so why don’t they use it instead of arbitrarilly penalizing the honest webmaster and rewarding the cheater competitor who tried to kill the other adsense accounts or blogs ?