Personally, when I mined ETH or SHF, I got 10+ nodes on my Win 10 machine that's on a wireless bridge that can only do IPv4 (a common issue with wireless bridges). I originally, didn't need to open no ports on ETH or SHF to get those 10+ peer connections. I've tried turning off the firewall, port forwarding ( but found that the feature is buggy on my EA6300 router and Linksys doesn't make a firmware fix for it), made rule exceptions on the firewall in windows, add those node from the OP and what ever else I can think off, but only can get connected to 4 peers. At least, it seems I'm still on the right fork, even with the low peer count. Maybe altcoinex is right, that it might be because the wallet that is used is from the stable version and not the cutting edge version with a lot of fixes.