Good to see you have "some" uploads even if they need to try to "force" their way thru any firewalls. Ideally this should say "true" & when so will also make some improvements to your results.

The reason 4.0 can connect easily is because it doesn't have the condition of "must be properly firewall configured" to be able to connect. But that theme in general is not good for the network because imagine another hundred thousand or many more saying they can connect but only very rarely upload. That would mean minimal search results or connetibility for everybody.