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I mean that while ADS in most games barely zooms in (say it goes from FOV 55 to 50), others might go from 55 to for instance 40. So even though it's still technically ADS it zooms much more.

360 for ADS will work fine for a lot of games. Some do have ADS zooming very much though, so using 360 might feel too fast. Personally I would recommend 0%.

When you have different FOV's you'll always have a trade off when converting. So for hipfire you'll have to find out what works best for you between basically all methods. Most prefer either 360 distance or MDH 0% though. MDH 100% will be in between. For ADS and scopes MDH 0% is matching the tracking speed (i.e. same mouse movement when tracking a moving target between all aims), 100% is matching flicks to the edge of the monitor. Percentages between 0 and 100 is flicking to that spot on the monitor. Viewspeed is a little bit more dynamic rather than a fixed percentage, but in the 70-75% range.

You are probably better off using the PUBG hipfire as the base for the calculations. The other calculator is matching sensitivity to this, and not CSGO. The difference in CSGO and PUBG FOV (if you are playing with FOV 80) is so large that any monitor matching method will likely feel off. So first convert CSGO to PUBG hipfire, then use PUBG hipfire to convert to all the aims.