Remember the key you are going for in your postural work is time. You spend 50+ hours on the keyboard a week. You need to be able to have a [postural] buffer large enough so there are no overflows into poor posture, which means a large work capacity.
Do try ART - (activerelease.com has practitioners probably) - it can work wonders. The basic algorithm is to identify the parts of the muscle that are tenser than the rest, bring the muscle into full flexion, then compress the tense area against the bone while simultaneously moving the muscle into full extension. This causes a mechanical stress that helps lengthen the tissue. You can try it on yourself pretty easily which can be useful.
I did some reading on this. Some practitioners claim they can bring about recovery of severe RSI in 3-5 visits. Does this sound realistic based on your experience?
It does happen though, but strangely only with certain therapists. There is one where I live that is renowned for fixing almost any musculoskeletal issue in one session.
My recommendation would be to find out which one is used by pro sports teams and go to them.
Do try ART - (activerelease.com has practitioners probably) - it can work wonders. The basic algorithm is to identify the parts of the muscle that are tenser than the rest, bring the muscle into full flexion, then compress the tense area against the bone while simultaneously moving the muscle into full extension. This causes a mechanical stress that helps lengthen the tissue. You can try it on yourself pretty easily which can be useful.