Im having String Buzz on the 4th and 5th Fret on my 8string. On the 8th Fret it sounds Like the string is slightly rattling on the Fret too. I use a .64 for Low A on the 7th String 27" scale. On the 8th String there some Buzz too but thats because the String is only a .80 on Low E so its little looser. I already raised the String Action to 2.75~mm but the problem still kinda persists. 5th and 4th still buzzing when picking a Bit Harder, Same with the 8th. Chords and notes still Ring Out but its noticeable sometimes more sometimes less especially on the 8 when picking it alone How can I fix it? Thought about adding some relief with the truss rod but how do I do it without fucking Up the neck? Any other suggestions?