The vertical FOV is the same with 4:3 stretched and 16:9, so you need to switch the conversion to MDH 100% instead of MDV 133%:
https://www.mouse-sensitivity.com/?share=1083d3cd8f5b3a3010a2dd484aba6bdd
That should feel better.
on October 26th, as said by the developers, they will add adjustable FOV in the game, can you look into it and add adjustments for the sensitivity? Highly appreciate it, thanks!