Thanks Milo
I was hoping that with the dual band ( 2.4 & 5ghz) the load would be spread with priority given to the 5g net. The 3700 also gives me the option of scheduling when access is avaliable. As it is I've denied access to the Xbox & when testing speed only the desktop was connected ( via wired LAN).
But if there is not a significant improvement on range and the speed is actually worse then there's not much point & I'll revert as you suggest. The settings as far as I can tell are the same so can't figure out why it's so slow.
Thanks for the help.