I have just signed up so new here. But saw this and I can offer some advice as I play with nails. Nail playing only works if you have nails that aren’t thin and don’t flex when they strike a string. So good nails are key. First you only need a 1or 2 mm (or no more than 1/16th of an inch) of nail extending beyond your fingers. Any more will impede your movement. Second, you need to file then and then shape them to take any corners off so that don’t catch the strings. Thirdly, get a nail manicure multi-grade nail buffer (from any good drug store) to smooth the nail edge. You can check if this works by running each nail sideways down a piece of nylon fleece. If it catches, you’re not done. Never cut the nails, always file them. Do the manicure no less than once a week but as often as needed. All this effort will give you the maximum fluidity in movement with less risk accidental string catching. Hope this helps.