I got 99 problems but my WiFi ain't one

Signal strength / noise doesn't appear bad - -20Db and -95Db

Are you sure those aren't bad? Maybe something in how your kit is reporting...those figures on the face of it are really bad.

Signal strength is usually measured in dBm (which means the signal level compared to 1 mW measured on a dB scale). 0 dBm means 1 mW. -10 dBm means 0.1 mW and -20 dBm means -0.01 mW. Typically, measured signal levels are much lower than 1 mW so Wi-Fi signal strengths will be in negative numbers and will usually vary between -80 dBm (0.00000001 mW) and -30 dBm (0.001 mW). What may be confusing for some is that a smaller negative number is higher (better) than a large negative one. A signal strength of -50 dBm will only be achieved relatively close to the WiFi router or Access Point. Signal strengths of -75 dBm or lower are considered poor.

Signal-to-Noise Ratio (SNR) is the ratio (calculated in decibels) of the received signal strength to the noise level. To achieve a reliable connection, the signal level has to be significantly greater than the noise level. An SNR greater than 40 dB is considered excellent, whereas a SNR below 15 dB may result in a slow, unreliable connection.

Something is definitely sprogging hard in your vicinity, or you’re unwittingly sat in a biscuit tin.

Anecdotally, I should be hitting 350+ on the Ubiquiti APs.

For my system, an Android Pixel 5 phone connected to a AP 3m away is able to get 260Mbps.

I have some interference from neighbour systems operating on channels nearby at high power.

I still prefer cables for the work machine as it's just way more reliable.