It is hard to provide too much light for a Ficus lyrata that is kept indoors.
Your problems may be a result of the repotting into a much larger pot. I'm guessing that the stoneware pot does not have drainage holes and that is an invitation for inadvertent overwatering and root rot. The soil that you used when you repotted is the likely source of the insects you are seeing, particularly if you used non-sterile garden soil. Finally, when plants are moved into larger pots, they tend to put their energy into filling the pot with roots at the expense of top growth. That may be why you are not seeing much new growth now.
Try to improve the light. Scrape off and remove any loose soil that you added to the top of the original rootball. That will help remove at least some of the critters. That will also allow the soil to dry deeper into the pot. When you water, make sure not to water too heavily so water does not collect in the bottom of the pot. Be patient and don't try to force new growth with fertilizer.
