I apologize if this is a repeat of this topic, but I found nothing that fits my situation. I am having a problem with my middle and ring fingers. If I am using my 2nd finger on C (for example) and try hit C# with my ring finger they bunch up and curve together (inward). This only happens when I try to move from my 2nd finger to the 3rd chromatically. I am using the book "Bass Fitness by J. De Pres" to gain more dexterity when I noticed this issue. This problem happens when I get to the higher frets (7-24). It is like the middle and ring fingers do not want to work separately. Is there any stretching or additional exercises I can do to fix these two fingers?