Hi everyone. First of all, but i want to share a table i made in order to pick the set you might need for the tuning you want. You'll find string set recommandations for: - 24.75" neck - 25.5" neck - 26.5" neck (7 string guitar) - tuning going from E standard to Drop F. You can find the table here. https://drive.google.com/file/d/18rsvvZFdBDYamFm6eZd766dAYgouDTCe/view?usp=sharing As i don't own a 8 string guitar with a 27" or 28" neck, i can't really add it but i could research about it. I don't pretend to have the best answers, but i wish to give you the tools you need to find what suits you the best and maybe create your own set Feel free to comment and give recommandations.