> I am running slon 1.1 with a "g" factor of 10000.

As I understand it (somebody please correct me if I'm wrong), a "g" factor
of more than 100 actually impedes "catch up".  The code has logic that
resets the sync group to 1 whenever the group size "grows" above 100 (slon
gradually grows to -g size).

If you grep your slony log for "processing", you should see a pattern were
the event being synced gradually increases more from the previous until it
exceeds 100.  Once it hits 100, it likely drops back down to zero.

So, try setting '-g 100' and see if the slon eventually makes progress.

-Michael