Why don't you just buy a top line wireless router like the Netgear Nighthawk AC1900 (this is what I have but you can buy others). Plug that into the Verizon router with an ethernet cable, disable the Verizon router Wifi signal.
I have 75/35 and I am able to get the full 75Mbits wireless on second floor through the 5Ghz channel - to put into perspective the max I was getting with Verizon GigE wireless router was 39Mbits through Wifi.
But remember, the connection is also limited by the network card your computer has. My laptop has an 802.11N wireless card that can connect to the router at 300Mbits on the 5Ghz band.
One of my other desktop has a wireless network card that can only connect to a max speed of 65Mbits on the 2.4Ghz channel so the max throughput connection on speed test for that computer is only 30Mbits.