Pursuing 40 MHz bandwidth

Whereas Tim Wilkinson KN6PLV has enabled 40 MHz bandwidth configuration in the recent nightlies,
I am interested in testing this on my link to our network.

Here is our longest link compared to my link:

The next 3 lines would look pretty if viewed in fixed-width format. :-|
nodename ............. lq nlq snr nsnr err mbps mile MCS max_tp
nc8q-huberheights-mvhs 100% 88% 24 26 45% 44.3 13.5 13 SGI 47.0
nc8q-kettering-mvhs .. 100% 100% 27 28 39% 21.2 2.6 12 SGI 41.0

Interesting and typical that the 5x longer link
...with poorer lq, snr, and err...
usually gets faster MCS and throughput

Whereas, due to the excessive distance, the 13.5 mile link would not
be viable for 40 MHz bandwidth, my 2.6 mile link of interest is.

Our local network has 100% outdoor PtP links.

According to this chart:
https://wlanprofessionals.com/mcs-table-and-how-to-use-it/
comparing 20 MHz bandwidth to 40 MHz bandwidth and
after reducing the SNR by 3 dB on the 40 MHz table;
there could be as much as a ~50% increase in speed.

Whereas 802.11 devices automatically reduce power as MCS increases,
switching from 20 MHz to 40 MHz bandwidth at a lower MCS might not
be a TX 3 dBm reduction.

Discussion?

73, Chuck