Hi Geordie502, Did you get a chance to verify it? :)

When connected to either TP on ANY device (laptop, iPhone, iPad) I always have full 3 bars - so I assume full signal... What's the link speed of wireless network connection on your laptop? On web...

Disconnect powerline adapters from the network and try to connect to AirPort Extreme directly. Do they work?

Provide your topology.

Your PA211 is out of warranty? You can buy a TL-PA4010.

The utility for Windows 10 has not been release yet, right? I didn't see it anywhere on TP-LINK website.