i'm still kinda new to this, and learning in bits and pieces (as ya do). just thought i'd ask, how much does your nut effect tuning stability? my LTD explorer stays in tune forever with just a plastic nut that hasn't been modified, however my epiphone sg goes out of tune pretty easy. it has grover rotomatic machine heads and also a plastic nut. could the nut be the root of the problem? i've ruled out strings, i change farily regularly, stretch them pretty well. and my explorer is fine. any suggestions?