I am following your lead and trying to slowly, slowly decrease my dosage. I was given a prescription for 30mg lansoprazole. I took the full dose for two weeks, then started pouring some granules out to about 20-25mg, and for the past week I have been taking about 15mg a day. I am feeling quite good at 15mg, and will be seeing the doctor this week.
I think I will try 15mg for another 2-3 weeks and then TRY to make the switch to H2 blockers. While they may not be as effective as PPIs, I think they may be slightly easier on the old system.
I am really glad you have stablised!