I have never done a taper after IVSM. However, I have only done 3 days of the steroids, not 5 so maybe with 5 it makes a difference? I do know that I react differently with IV steroids vs. oral. I dont like either one but oral gives me jitters and insomnia. With that said, I'd rather not do a taper.
Good luck and I hope the steroids help you through your current flare.