Had a few of them however now only seems to get to 4 connections. Must be not enough nodes or people using this coin enough for more nodes online.
As long as you have the 'max-connections' set to something more than the default (which either 6 or 8 IIRC), you should be able to connect to as many as possible via that setting. I currently have only the 2 mentioned in the OP in my config but have discovered the others via the network. I'll post my complete config below just as reference.
Are the default ones that it ships with not working?
The 2 listed in the OP should be enough to get you going. Here's a complete copy of my instantcoin.conf file (also make sure the file uses a lowercase 'i' in instantcoin.conf as it is case sensitive). DNS seeds are also being worked on so that the 'addnode' statements are not needed to find nodes on the network but that work has not been completed.
Also the node that I run 207.29.218.6 is on somewhat older hardware and will be upgraded probably this weekend. Put the 207.29.221.125 node first just to be safe.
rpcuser=username
rpcpassword=password
rpcallowip=*
daemon=1
server=1
maxconnections=100
gen=0
testnet=0
listen=1
addnode=207.29.221.125
addnode=207.29.218.6
* This config is for a full node meaning you want others to use you connection as a way to connect to other nodes and sync the blockchain. If you want to only connect to the network and download the blockchain as a client the below config should work for you instead. If it gives you any problems, try adding the other statements above until it connects (rpcallowip=* and listen=1 may be needed although I haven't tested it without these tbh).
rpcuser=username
rpcpassword=password
addnode=207.29.221.125
addnode=207.29.218.6
