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Out of curisoity are you using the NowTV Hub 1 or newer Hub 2 Router ?
I am guessing who have tried different WiFi channels in the Hub setting ?
Surprised the powerline adaptors over Ethernet didn't improve things (what make and model did you try) ?
I appreciate you are settled with powerline adapters - just a word on that from my own experience - I had 5 powerlines on my network - 3 upstairs to get better connection than wifi. They kept dropping out. Put ferrite core clamps on everything that looked like it was a power cable but no different. Cut the number back to 3 powerlines and it works a treat. Mine were a mix of 1200mb, 500mb and 200mb powerlines. Now using 2 x 1200mb and 1 x 500mb. I have been told that the higher speed powerline adapters are more susceptible to quality within the power cables in your house so more stable connections with the slower speed adapters - however I have settled on reducing the number and hardwiring an ethernet cable up the side of my house and into an upstairs room to get rid of two of them.