Ditto what Rob said
Ditto what Tgal said
Ditto what Merrylin said
Ditto Steve's saying "What else can I say?"
From your own knowledge of Prednisone and its use for Lupus, and from the knowledge of your rheumatologist....you have made the right decision about remaining of the dosage prescribed by your rheumy.
You should also know (and consider) that, for many, tapering too quickly on the Prednisone actually can cause some symptoms to re-appear and/ for them to worsen and for new symptoms to crop up. So the slower the taper, the better!
I wish you the very best
Peace and Blessings
Look For The Good and Praise It!