Practising correctly does not seem to be fixing the problem. When I attempt Brouwer's Simple Etude 6 my hand feels like a stiff claw and I seem to be putting in most of the effort to preventing the fingers from 'pointing straight out.' I can no longer attempt Recuerdos de la Alhambra because fingers just seem to want to 'spring out.'
Christopher Davis suggested the following:
Tried doing this but nothing is improving, at all. If anyone else has any other tricks, I'd warmly appreciate hearing about them.I would suggest, you do a lot of plain, boring arpeggio practice. Focus on moving very gently -- play quietly, keep a light touch. There's some good stuff about arpeggios in the introduction here: http://www.classicalguitar.org/freemusi ... ani120.pdf You don't need to go crazy and do the Guiliani 120, just play some arpegios in the different combinations -- drop the left hand completely and focus on the right.
And then stop playing everything you've been playing. Pick some new, extremely simple things (think Carulli or some of Sor's collections of small pieces) and focus on playing them with your new technique. Practice is small bursts where you don't build up tension. The goal is to avoid the muscle memory you have on the other pieces as well as create some new muscle memory. Give it a while (think in terms of years) before you go back to your old pieces.