Trying to use your pronunciation guide is frustrating! First, the respellings are frequently different from what the audio says. Example: Spica - your respelling says SPEE-ka, but the audio says SPY-ka.
Also, have you never heard the phrase, "VEE-ga is a star, VEY-ga is a car"? Both your respelling and the speaker say VEY-ga. That is the correct pronunciation for an automobile made by GM in the early 70s. Not a very good car, by most accounts.
Maybe you should find an astronomy professor to help with the pronunciations.