It sounds as if you are taking very good care of your plants.

Usually AVs need to have a change of soil mix about twice a year.

The yellowing leaves could be just because of age or they may be missing nutrients.

Personally I would take off the yellowing leaves and repot. Since you would need to take off a lot of the old soil to replace it, the plant will go into a small shock and not grow for awhile, making new roots in the fresh soil. The plant needs this energy to make the roots so it would not be making flowers. At this time, it is preferable to take off the flowers but you can leave them on and let them behave naturally.

Nancy

Thanks for your reply. How much soil needs to be changed out when repotting? Do I leave some soil near the root? Shall I try rooting some of the leaves I cut off or are they too old to do well?