Full Gb Wifi with BGW320-505?

I'm attempting to utilize my full potential with my 1 Gb fiber speed on the BGW320-505. Previously I had 500 Mb speed and was able to pull a speed test that hit a full 550 Mb/s on my desktop via a Wifi 6 PCI card.

So I decided to upgrade to 1 Gb speed. However the max speed I'm able to get now is around ~600 Mb/s, which is only slightly faster than my previous speed I was paying for. As I'm paying more for twice as fast speed, I want to get the full potential, however I can't get it to work.

Has anyone successfully gotten a full Gb speed over Wifi with the BGW320-505? And if so, how?