I just replaced my google wifi (4 modules) with 2 Deco X75s (basement + 2nd floor). house is from 1915, only 2,600 sq ft. It seemed fast until I added all of my IoT devices and Macs/iphones. Now it seems as sluggish as my google wifi. 

When I'm wired into the base I get 920 down from my ISP to my computer. If I unplug, I get 220 down (and that's 4 inches away from the base). Is that expected? I had really hoped that this Deco would solve a lot of my wifi issues from the rave reviews of speed and coverage, but that has not been my experience so far. Any creative thoughts would be greatly appreciated 

(40 devices total loaded, including IoT ligtht switches, speakers, computers, iPhones, 4 nest cameras) 

My ISP hub is located rigth next to my LG Flatscreen and the brick base of my chimney, but I assume if my laptop was 4 inches away it would reduce any noise or transmision issuses for my test.