Bro,
Downgrading is easy if you actually have a problem. If you don't,
unfortunately numerous MRI scans and specialist consults are not
going to help. Nowadays recommendations by a specialist does not
carry much weight. Most MOs and medical board chairman will
strictly follow the DOD(secret bk). If there is no evidence to
warrant a permanent downgrade then you might only be given a temp
downgrade which for an NS man is seriously useless...... not to
mentioned your medical expenses including an MRI would have been at
least a $1000.
Just my opinion, still your choice!
Cheers