I am currently at 99% and lvl 200, taking it casually now since I got the Pacifier and Enforcer.
The trick is, at the start you will obviously not become a pro even with the tutorials, just keep on trucking and trust your guts, because these things are almost impossible for the human eye when they’re not obvious. I can comfortably maintain my % and take less than 15 seconds on each result
Hell, I had times when I thought the dip was the transit, but for some reason it was wrong and it was where there was no dip at all a few inches to the side!
Just keep going, watch how they behave and eventually you will understand the pattern, sometimes its easy to understand which one is a test or not, because the dips, as obvious or not, they will be there, and even with just 1 transit marked case you’re not sure just go for it, at least it won’t punish you as hard if you get a few of them right, you can always Skip some by pressing the X button and opening again case you are really not sure about it.
Pretty sure this guy can give you tips about it better than me tho.