Help me reach 300mbps - Time Warner Internet

This question is about "Help me reach 300mbps", with Time Warner Cable internet and apps. So I recently upgraded to a 300mbps connection, but I'm not seeing those full speeds. Currently capping out around 100-130mbps down.

Here is my current setup:
technicolor-tc8717t downstairs
Netgear A6100 Wifi Mini Adapter plugged into my computer upstairs

Wondering what the issue is. If its a TWC issue, or my hardware, or just the distance.

It would be much appreciated if someone has a solution. Change hardware? Add an access point? Run ethernet cable upstairs?

Thank you in advance.

This topic covered Help me reach 300mbps, and TWC cable internet service.