Help with anchor band?

So, I have an Arcadyan, and have been moving it around to find the best spot. I just found one, was getting 320 down and like 11 up (as opposed to the 0.5 to 3 up in the previous location. When I checked, it was connecting to N41 on the 5G side, but Band 66 on the LTE side. A bit of time has passed, and all of the sudden, I'm down to 70 down and and roughly 1.5 up. The 5G side all looks the same, SNR of 15 or so, but the LTE side has dropped to Band 2, and the SNR is worse.

Any ideas on what I can do to help with this? I'd love blazing fast speeds, but would be more than content with a solid 30+down and 5+up.

Edit: The download speed could be a speed test server issue, as trying [fast.com](https://fast.com) instead gave me 230 down just now, but still only 1.2 up.