Apex uses MDH 0% as the scaling factor for scopes. The scalar is a multiplier to the base sensitivity, and not the scaling factor. And since it is applied to all scopes this means that any other conversion than 0% will be different depending on the scope. So in your case MDV 172.8% is 1.169931 for ADS (ironsight) but 1.434049 for 10X. In other words you can only perfectly match one scope/aim to your preference, and all the others will just have to be what the game scales them to.
Hopefully they will address this in a future patch!
Weapons scale the ADS FOV and hence the 360 distance differently.
And since you can only have one ADS sensitivity you have to choose which one you want to match 360 distance for.
This is correct, but
this is wrong. The correct cl_fovscale formula in your case is 86.631971/70 = 1.2376
This is because the calculator rounds the FOV to the nearest 6 decimals, in reality this difference is negligible.
It's best to post it in the game specific thread, click the game title in the game info section of the calculator for the game you have issues with to go directly to the thread:
Also to make it easier to troubleshoot the issue post a screenshot of the calculator including the conversion setup. You can use snipping tool in Windows and just paste the image right into the post.
The cl_fovScale is based in 4:3 resolution, so the correct formula would be use 90, since 90 FOV in 4:3 = 106.26 in 16:9, so 90/70=1.285714.
Compared to the first scope zoom level in CSGO, yes that would be the same
They use different FOV types, that's why the config FOV is different. The important part is that the Actual HFOV is the same, so you are doing it correctly.
This is a bug in the game, it displays the wrong value. The value you set in the config file is what is actually applied.
The issue is that Apex use MDH 0%. So while your calculation is correct for 1X scope, all other scopes will be 0% matched to this instead of 100%.