modal’s sheet is the only thing we have, probably because it’s a lot of work to determine affix drop rates with all the variables, Modal also explain this process How to determine the drop chance for an MI w/ specific affixes
And it’s not like other items with just a single fixed entry like we can see on grimtools (aside from real world RNG ofc), so you’re contending with layers of chance
also keep in mind everything is user created tools, GT etc is not something the devs gave us, so if you want something more or better than Modal’s tool, you’d have to make it yourself or convince another user to make it
(and i would assume you’re still going to run into the same problem you have right now, real luck application isn’t a fixed line vs probability)