Hello, so I am looking for some suggestions on my network. I currently have an AX11000 and two deco x68s in AP mode.  My Ax11000 is in the basement and connected to a CM2000 cable modem.  I have ethernet ran to the next floor where i have the main x68 hard wired.  I would venture to guess it's about 30' from the ax11000.  The other x68 is on the second floor.

i have noticed that my wireless devices are getting less than 100mbps in speed tests.  I shut off smart mode and isolated the 2.4ghz network so that only the 5ghz would be used by my phone and ipad.  However i am still getting slow wireless speeds.  Even standing right next to the ax11000 i get slow wireless.  
 

i am not sure if the devices are overlapping and the signal has interferance.  Or is this becuse i have the decos set in AP mode?  Do they not work in mesh when in AP?  I am wondering if i should get a couple of the onemesh range extenders instead of the x68 deco units.  With the ax11000, do I even need the decos?