Hi xrpodn,
It all depends on how long you've been on Pred. Such tapering is ok when Pred has been taken for a short period of time ( a few weeks or or couple of months) otherwise a slower pace should be adopted.
See for example:
http://neuromuscular.wustl.edu/mtime/mgrx.html
Also be careful below 10 mg/day, about 3 mg corresponds to the natural production rate of cortisone by the surrenals. If they have been shut off due to absorption of high dose Pred for a long time, they will probably not respond.
Maurice.