As long as there is no skeleton showing, it's probably fine. It looks great in the photo. These corals (btw, they were reclassified as Trachyphyllia geoffroyi, so they are no longer "wellsophyllia") tend to inflate less when in high flow or high light. If the colors stay on it, but it still doesn't inflate as much as you would like, then I would move it to lower flow. If it starts to lose its colors, then I would move it to a less light area.
Although these corals do appreciate meaty meals, you don't need to feed every mouth as there is some energy passed between the animals.
Also, some corals need up to almost 6 months to fully acclimate to a new tank. Again, as long as there is no tissue recession, it's probably fine.