I’m not sure I quite understand. From the sounds of it, everything is working as intended at the moment. The auto compare setting simply inverts the control button’s functionality in regards to item tooltips.
Also it shouldn’t matter which order you press alt and ctrl in, it is only checking which are held, not in which order they were pressed. I think we only have 3 combinations, not 4.
With those in mind, what is the problem? Are you basically asking for a toggle that always shows the full details? This probably won’t be the default functionality as it can make some tooltips really long and once you’ve read it a few times for an item, you probably don’t need to see that info by default.