So, those are the official addnodes we use from now on or is there any other we have to use?
If your able to reach IP 76.127.202.17 then you should first fully sync the blockchain using the following in slimcoin.conf ;
listen=0
maxconnections=1
connect=76.127.202.17
When you are fully synced you should shutdown slimcoin and alter the config. ;
listen=1
maxconnections=8 (or more)
addnode=76.127.202.17
addnode=107.181.250.216
addnode=107.181.250.217
Which should help you to bootstrap more p2p connections to updated nodes.
My nodes are not 'official' slimcoin nodes, although these vps servers have good uptime and I will try to ensure that they stay up and running.