Hello, everyone I've been practicing floating thumb since last month, with classical guitar position. However, whenever I play the bass, I feel unstable because there is no anchor to hold the bass. Well.. before I play with the floating thumb, I could anchor the bass with my forearm so that the bass doesn't move while playing. But with the floating thumb, only my left hand is holding the bass and I found my position is changed while moving on the fretboard. I'm trying to get used to the floating thumb but the unstable bass position makes me feel uncomfortable. Also, my left thumb feels fatigued because only the left thumb is taking all the pressure from the neck. Is this normal? or is there something I missed with using floating thumb? I know holding bass with my legs could be helpful but I want to practice in the same way as when I play standing. Hope there is some advice for my situation. I uploaded my playing posture images so you can find out my problem.