Tapering off of Lithium

My Pdoc is casual with me about everything with my meds.  She knows I can take care of myself since I do lots of research.  I am LOVING my Abilify so far and can already tell a difference.  I have not been "jump up and go" in ages.  I am already going out more and enjoying the springtime.  She let me drop down a half of a pill 1350mg before and now at 1125mg.  I want to get down to 900mg all this month while taking the Abilify.  I meet with her June 3rd.  Can I taper off one more 1/2 pill before then?  I have been down 1/2 pill for two weeks.  I did get my level check last week and waiting on the results.  I was at .9 on my 1350mg.  I hope some of you have been through this and can help.  I am also on Inderal b/c my blood pressure has been elevated.  I have water retention from the Lithium too.  So the inderal is helping and I have been drinking more water.  I have dropped 5 pounds this past week!  YEAH!  Ok, hope you guys can help me!  Thanks!  ((((hugs))))  Kristen