-
Some good advice here, something you can try is put a capo on the 5 th fret this will simulate a smaller guitar and if you are able to form the chord here easier (I recently went through this and came to the conclusion it was guitar/setup as no matter how hard I tried I would get a slight buzz but then didn’t when I had the capo on. Then I went through the thought process I needed a wider neck more space but if I could do it further down the neck why not at the top which led me to looking at my hand position instead of getting a new guitar (( which I will do eventually just not yet)) when I started making subtle changes to the positioning of my wrist this would push my fingers more upright so less contact and this has fixed it. For me I’m I’m ok with a standard c chord but when I’d try and introduce hammer ons with the middle I’d always mute the string but it has got a lot better now and once I get that new guitar with a better set up I’ll have much better form and technique from working this through. Don’t get me wrong I went through a tough time with with this to the point of stopping enjoying it but I’m through the other side now. Video yourself on your phone it can give you a real insight into what your hand is doing. Sorry to ramble just sharing my experience which might be different to yours but I had success working it through before spending £££
Good luck