Hi Scrubbs,
If you are looking for some sensible pred taper schemes, you may consult
http://neuromuscular.wustl.edu/mtime/mgrx.html
(It's the last reference in the "Useful sites for MG" on top of the page)
As far as I am concerned, I never taper more than 10 % for each step.
Before doing that, I noticed that for about a week, I felt rather dizzy (weak?) and I assumed that the step was too big (i.e. going from 25 to 20, which is 25 %...). With a 10% step, the transition has ever been smooth without any odd sensation.
My step length is 3 to 4 weeks.
Maurice.