The Ibanez FRG7620 in my Avatar to the left has a Gotoh Floyd, Tusq nut, and a straight string pull to the tuner posts of the Hipshot Locking tuners. No locking nut. I’ve slotted the nut and polished the slots and it stays in tune wonderfully despite my Vai-ish attempts to knock it out of tune. There’s a video tutorial somewhere on here that someone stickied for easy reference. If you have straight string pull, good nut treatment, good knife edges (pointed, not rounded), good locking tuners with no slack on the post, then you have the circumstances for success, the rest is up to your setup of these conditions.