I've been using the one that I guess is built into Google search (it appears under the search bar when searching for "speed test"). Although I just tried it with Ookla and got similar results. I...

So I've been checking the speed periodically, and the upload speed dropped back down to about 11 Mbps. I ran through the above steps once again (reset router to factory default, import backed-up...

I backed up my settings then restored the router to factory default and ran a speed test: https://imgur.com/a/KZozLX4 Then I restored the .bin backup and ran it again: https://imgur.com/a/1Ksz02U...

Hmm OK, I can try a factory restore. Can I backup my settings, do the factory reset, then reload the settings? Or will that defeat the purpose?

https://imgur.com/a/FUPjhf9

I just tested on my phone and it's getting the same speeds as my hard-wired PC.