I always tell beginners when they repot into a ceramic or glazed pot, DONT!!! Use a clay or plastic pot.
I am afraid of something leeching out of the ceramic pot. I advise people to just display their plants that are flowering in a ceramic pot.
After all, are we growing orchids or are we growing pretty ceramic pots?!?!?!
Secondly, I think that the size of the ceramic pot is fine. It is NOT too big. When you use New bark, it takes a little time for it to readily hold moisture like we want it to. The easiest way to get it to do that is to Pre-Moisten the bark. I use an old colander that I would normally use to wash salad or drain pasta. You place the bark in the colander and rinse it a few times with warm water. Rinse, let it sit. Rinse, let's it sit. Maybe three times in twenty minutes. You get rid of the dust in the media and when you water your Phalaenopsis, the media accepts the water and holds it more readily.
Once you repot the plant properly, leave it alone in the pot. Don't pull it up and look at the roots. They will look better after you repot!! It DOES NOT happen overnight. If you repot the plant today it will look better, put out new roots in 6-8 weeks, not DAYS. It may be closer to 10 or 12 weeks but they always perk up!!
In a 5" pot, try watering thoroughly every 5 days. One day for each inch of pot. Water it well enough with Luke warm tap water so the water pours out of the drainage holes of the pot. After 5 or 6 waterings, the bark will hold more water longer and the plant will recover. Trust me.
