Sorry if this is a bit rambling but want to include as much info as I can.....

I have a mixture of TP link powerline plugs a 2 x 2000mb 1 x 1300mb & 1 x 1500mb & I have recently added 3 x P9's to boost my wifi  which I thought were working fine, however I have recently noticed that my powerline network is not performing as it was neither are the P9's

I finally got FTTP this month and have been struggling with the speeds I'm getting around the house, plugged direct into the router (Draytek 2762 with wifi diabled ) 850mb / 200mb, on the wifi next to the P9 plugged into the router 450/120,  on the wifi next to the p9 at the top of the stairs (say 5 meters across plus up a set of stairs and then another few meters across) only 150 / 80 (having disconnected the wifi and reconnected to ensure I'm connected to that unit) but then on a machine thats connected to the homeplug network only 60/65

I've checked all my cables and they are all cat 5e / cat 6 cables

multiple restarts of all devices / routers

Deco network set as AP mode, Fast Roam & Beamform switched off

devices are connected to the 5ghz ssid not the 2.4 (still need that because of lights / switches)

powerlines are used mainly for Tv's / PS4 but do have one connected to an 8port gb hub with 3 / 4 devices plugged into the switch (where I'm getting 60/65)

am I better off ditching the powerlines completely and using the gb ports on the P9's and letting their powerline function serve as the powerline network, or am I missing a tick somewhere here

don't think its a house wiring issue, as the house is less than 10 years old and we have only had 1 socket moved around in that time.

any advice / abuse would be appreciated.