On my left hand, I use my index finger for muting strings and as the fulcrum of the three other fingers. So my index always stick straight on the fretboard, and that makes my pinky also stick on the fretboard as well. (my middle and ring still curves without any influence from the index) Lately, I start to notice noises when my pinky strikes a fret, especially when i hammer-on. My pinky is so straight that when it strikes a fret, it accidentally strike the fret under it (usually frets on G string). I tried weakening the strike, that noise became harmonic! This is somewhat uncontrollable when I play fast. So, how can I fix this? Do I have to curve my pinky, or weaken the strike more?