I have had tuning issues on different brands over the years as well as on my Gibsons. It makes sense that any manufacturer cannot get everything perfect for sure but other than a major issue with a guitar tuning issues are most likely a string issue. I have seen the good old wrap around and under method work well for over 50 years on my guitars. So much that every new guitar I get is immediately re strung A. for tuning issues and B. to get everyone else's DNA off it. Nut sauce is great, stretching your strings in is a must, then address the nut if needed.