Every 2-3 days sounds like too much, especially in a plastic pot. Remember, bark on top of the pot is going to look (and get) drier much faster than bark further down. You need to know that it is drying out at the bottom too before watering again. You mentioned it's in a clear pot. Can you still see drops or condensation in it? Make sure to look underneath too. I had a phal in a clear pot, and I waited until I didn't see anything like that. Usually it was about a week.