@David-TP 

thanks for the reply.  There's a few iot devices but the issue is the 5ghz band where the vast majority of my devices need the speed.  I have a 1000/50 internet connection and my main router is getting 500 and that is when I'm next to it.  Having both 5ghz channels sitting on 149 and 40 is really slow and the channels are congested.  Even if I could change the wireless backhaul channel around with the other channel would help.  I will end up putting my old router back in because I can change my channel to the right one and get 750 at the main router. 

  @ARGamingPK1 thanks for the suggestion but every time I use network optimisation the only channel that ever moves is the 2.4ghz. 5ghz never moves.  Says it's perfect. Reboots do nothing to improve the situation.