A clay pot would help certainly but may I suggest for these types of top heavy orchids that you use an internal wire stake with enough girth to get the job done? It might be tricky to visualize but they are fashioned out of a pretty stiff wire formed into a circle at one end. That end goes into the clay pot. I use a few clay shards for a little extra weight in the bottom of the pot. The other, straight end to the wire extends up and out of the pot. So now you can stake or tie up the newest pseudobulb to the vertical wire. Stake it fairly early on so when it blooms it is as close to vertical as possible making the entire plant less tippy when it flowers.
When you try to stake a plant any other way in most medias, the looseness of the media adds to the overall floppiness of the stake. It becomes difficult to keep it upright and to do its job.
