Hi there...
If the current taper schedule is working well for you - especially as you're already at 10mg and things seem to be looking good, I wouldn't be too concerned. If all's going well, then you'd rather get off steroids sooner than later.
However, if you feel like you might be close to flaring up then you could speak to your GI specialist about tapering at a slower rate below 10mg i.e. tapering by 2.5mg per week instead - that only extends the taper by another 2 weeks or so.