FOV is very important. For CSGO leave it at the default unless you play custom games, and always enter the FOV configured. The actual FOV will be calculated.
You should first convert hipfire to hipfire using 360 distance. If you use the config file conversion, you also need to fill in an already existing value. You can use the default value of 50.
Then convert hipfire to iron sight using Monitor Distance 75% and see how that feels. For iron sight you need to enter a lot existing values, remember to use the values from the first conversion.