Yeah, if you have the spare time to try your hand at luthiership, that's the real value of a cheap guitar! I'll assume you've already tried replacing your strings. Where's your fret buzz? Frets 0-4 are usually a nut problem (on a Gio the nuts are terrible, so just replace it) Frets 4-19 are usually a truss rod problem (ignore everyone saying messing with the truss rod is dangerous, if you have excess bow then it can't possibly hurt to dial in a tiny amount of backbow at a time) Frets 19-24 are usually a bridge problem (again, Gios don't have great bridges, check on Jemsite etc to find out what you can drop-in-replace... If nothing can drop-in-replace, it's time to adjust your action and/or do some filing and intonation) Regarding your chords, now would be also a good time to file/sand down your neck to the actual Wizard profile of 17-20mm, which should reduce the amount of pressure you need to hold chords. Alternatively, it could be a fret integrity thing (you've been playing 3 years, after all). Consider doing your own fret crowning. Alternatively, replace the neck! (be careful, even if you have a 56mm neck there's no guarantee a 56mm Super Wizard Prestige will fit in the pocket, for example. also, intonation might be an issue)