Same "problem" here.

4,000 hosts max. You can clearly see that there's a limit because it's always EXACTLY 4,000 if the net is fully working.

And ... eh 60 Peers?

Well, I have max 30 here, despite trying and trying to get more.
Yes, I am ultrapeer, no bandwidth restrictions either.
Is it my version?

Cougar, which version do you use? An older one I suppose where these limitation might have been not as strict as now?