I just purchased a Deco X55 and have Verizon FiOS with 300/300 up/down. On wireless, I easily hit 315+ on download. On upload, I'm maxing out at 160 - 220. On the Google Nest Wifi router I had for the last 3 years, I consistently got 340 upload speeds. I am using the same cables and setup as the Google Nest router but getting half the speed. And when my PC is wired with Deco, my upload is easily 300+. 

I am debating returning the Deco system if this can't be fixed. I have family members with Xfinity and Altice (cable) internet and Decos and they have always worked amazingly. Any help would be appreciated. Bummed this product does not work well with fiber ONTs.