Thanks for everyone’s advice. I just changed strings on my 594 about 2 weeks ago but will string again with 10’s but a different brand than the NYXL as some of you guys have suggested. I tried the graphite pencil with no luck. Even thin pencil couldn’t get down into high E slot. Nut too thin/tight plus black graphite on white nut looks awful but you can wipe It off fairly well. Fortunately I have 2 guitars that are rock solid, my Suhr standard plus and my 2018 Les Paul Custom shop reissue. Both are bullet proof and I can play gigs with no worries, total confidence. However been a PRS guy for years and won’t stop my pursuit. As expensive as they are it is however surprising that any tuning issues would ever creep in. I can practice for 30 minutes, walk away for 10 or so and way out of tune. Sucks. Anyway, thanks to all for great tips. Enjoy your weekend.