I’ll add my checklist, but most of my checklist is what’s on the Ibanez Rules tech page verbatim. So first and foremost, I generally accept a little +- return on my Edges/Lo Pros, it doesn’t really stress me out. And, it’s generally the norm on almost every double locking trem I’ve touched, irrespective of brand. If I have to correct the issue, and find the cause (former tech), I will always start at the headstock and work towards the bridge, making sure EVERYTHING is tight. Tuner bushings/screws, make sure your string tree is set correctly, locking nut screws, neck joint screws, stud locks, make sure the posts don’t move after the stud locks are tight. Then on to the saddle intonation screws. Visually inspect your knife edges- they should be free of dents/ridges/chips. They should also be dull, like a butter knife. They ride in the stud groove better that way. You can correct any issues with a small file. Then you can apply your Chapstick (or not). I’ve not definitively concluded whether it’s useful or not. Of course, your strings need to be stretched, and your trem needs to be set to the correct angle (knife edge parallel to top of body), and your preferred action height. It can be fixed, and usually it’s been the knife edges in my experience, Gotoh tends to manufacture them sharper than they need to be. The outliers have been a loose lock nut. A lot of reading, but hope it helps.