As a brand new student of bass (literally started days ago), I can now stretch my four fingers comfortably in 1FPF position. They, however, refuse to stay there. Every time I position them, they stay for a few seconds, and then I'll have fingers sliding back together again. (My middle and ring fingers in particular seem to be married) This is for the lower frets, 1-4. This is a problem even with the 1-2-4 fret positioning (where F1-Index, F2-Middle, F4-Pinky). My damn fingers need to get a grip. Literally. Tips for my delinquent fingers? Thanks!