There are a few of these floating around. You kind of have to sift through countless posts to find the links, though. I have more luck using search in the Beyond the Manual section for " settings."
But the fastest way to nail settings by far is to set up the test strip @evansd2 came up with, or the modified version by @rbtdanforth.
It will take a little bit of work to set it up in your GFUI at a couple of different power settings, but the future savings in time and materials is totally worth it. When you want to use a new material, stick it in, pick a power setting, and cut the test strip on an edge. You can quickly see what’s going to burn through all the way with the least amount of burn-through at the corners, what will make a nice score line without burning through, and with the modified version placed over an edge, how deep the engrave settings will go. At most you might need to try it twice, to see what different power settings will do, but I’ve gotten so I can usually pick one that works well enough on the first try.