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Here is my practice today. Polishing the nail carefully with sand paper does help a bit with the sound. I try to use the least movement of right hand fingers in order to relax.
While practicing, I had to stop regularly as soon as I noticed there was tension building up on the right hand forearm. If I did not stop, the right hand forearm would be tense and it would be much harder to relax it afterwards. So in my own experience, you should take short breaks to prevent tension as soon as you notice it coming.
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I took a break from this piece for several days. Today I come back with the piece. My recording today has a lot more buzzing and mistakes though. Maybe because it was recorded at the end of the evening :D. It felt quite hard to keep up the tremolo at the last 1/3 part. I was at the edge of tensing my right hand.