Bluetack - FAQ
Is one more source.
Found it (after sleeping over the question my memory dug it out
).
I'm not perfectly sure, if we're using the List compiled by Aaron, too (a user from the Gnutella Forums). That one was quite extensive.
It might be that it blocks a bit too many IPs.
Since you see a reduced number of download candidates, it might be that we should switch back to only the blutack and the gtkg list.
Could you ask your users, if their download exterience also deteriorated?