Hi Fraser!
Thanks for the quick reply. I understand I won't get 150 down directly over wifi but all of my devices are 802.11n so unless the duma only does single stream wireless to my devices this doesn't really make sense. 1 stream at 70% would be 35mbps so that would be correct if I can only expect 54mbps down max.
The router is on top of a cabinet with a wall behind it. It is close to a stereo receiver, my ps4, a harmony wifi remote control hub and a tv. I'll try repositioning it for testing sake. Generally I am within 10-30 feet of the router.
Unfortunately, 1, 6 and 11 are all pretty saturated where I am. The 5ghz band is not that saturated.
I can try another router I have to test that but I really do enjoy the duma's features, small form factor and not having to use the extra electricity.