On some days, days like today, I have real trouble keeping my arm still, which obviously creates consistency issues. By this I mean that the arm adds an unwarranted rotation movement, and also jiggles around a bit. Has anyone had this problem, and solved it, or at least found ways to minimise extraneous arm movement?
I don’t know if it’s the same issue I have.
I had to overcome string muting issues, for example playing two string arpeggios on the E & B strings, I had to train myself to be conscious of muting the other strings all the way to the low E string.
This involved properly resting and posing my hand on the bridge, maybe this will help you if you’re not already resting or lightly anchoring it.
I have thick fleshy palms, not sure if that’s a good thing or not, but I guess I got em’ work for me now.
I had the same issue and I solved it by practising a three string roll on the fourth, third, and second strings, down, up, down, up, down with cross picking on opening strings. I watched my hand and arm in a mirror and by staring at the top of my arm where it meets the wrist I could see every time it rotated and could then stop doing it. Then I moved onto single escape picking with the stable wrist across three strings.