I am impressed that you were picking off flowers to induce larger individual fruit growth. This is a fairly advanced maneuver and many gardeners may think it is counter-productive. My advice to you for your indoor Citrus plants is SUN, SUN, SUN. Give those little plants as much light as the geography of your home allows. I would strongly recommend placing them in a South facing window (if not a South, go for a West facing window). The Sun is low in the Southern sky in winter, and as it passes throughout the day, it will shine right into your Southern facing windows. Also, be sure to not over-water your Citrus. Citrus cannot not handle extensive moisture for long periods of time in the rootzone. Their potting soil should drain well. If the pots are sitting in trays to catch the runoff, be sure that the pots are not submerged in water in the tray for long periods of time. My lime tree is in a container, which sits in a water collecting tray. I drilled a hole in that tray and caulked some plastic tubing into the hole to drain off any excess water directly into a rain gutter.