Ficus does not backbud easily as long as there are leaves on a branch. So removing the leaves including the green growing tip, will cause them to backbud. I would however do this after a good strong growth of the plant. Plants will respond best when in optimal health. But continuously clipping back to two leaves, you are weakening the plant, and as a result you will get very weak butting if you defoliate now.
So n short: Let it grow, let it thicken and every so often, trim back. (That is what I am doing in any case)