I have been using the regimen on and off for 5-6 years. 2 months ago I stopped using the regimen in the mornings and only applying a VERY small amount at night compared to before when I used the full dosage twice a day. Everything went well for the first 3-4 weeks and then I had some flare ups. Today everything is going well and my skin haven't been better for years than today.
I know how you feel about tapering off the regimen. The thought of your acne returning will drive you crazy. It drove me crazy and that's why I followed the regimen religiously for such a long time.