Gigabit 2x Slow Upload Speed

Hello, I have been trying to solve an issue with my upload speeds. I have gigabit 2x and should be getting up to 300mbps upload. I am consistently getting around 30 mbps or less. It will periodically "spike" to 40mbps, but that't the highest it ever goes. I worked through the troubleshooting, but nothing helped. 

I am using an Arris S34 modem and an Asus RT-BE58U router, both of which are relatively new and should not be a bottleneck.

What could the other issues be? Has my area not been upgraded? I don't want to be paying for literally 10x the upload speed I receive.