If you are congested in the Wifi bands simply get a new router without wifi ( or turn it off), and wire the old wifi unit into bridge mode, and put some CAT6 cable to place it as close as possible to your main work area. If you need power to it use a second cable, and cut the power cord and use those 4 pairs as power leads so it will be close. High up and as close as possible, if it is on the floor in a cellar no work, and then all you are out is the new 10 pound Billion router, and a few metres of cable and 2 crimp on connectors, plus a screw to hold the darn thing up by the one hole.
Lose the Poor Orrid performance Equipment, either use a cable through the wall, or string it along a picture rail around the room to the PC.
As to Lenovo, the wireless performance can best be described as shyte, my one is always either connected via a cable, or I tether the phone to it and use that. Made no difference using the original Win7 drivers, or the ones that Debian uses for the chipset, it just is poor. If it connected and would stay connected for 10 minutes that would have been a miracle, even after turning off all encryption and leaving the router wide open ( and watching for the connections as well) with the laptop sitting 1m away from it.
Might be better now, my sister's Lenovo connects to the Billion wireless reasonably well, and works well enough for her, with the scan only showing 5 local AP's around.