Concerned about how my aligners are fitting: How do I know if they are molded correctly? (Photos)

My provider is not reassuring. I'm on my second set of molds and there is a large enough gap on my upper pallet that I can hardly speak clear and air and saliva push out my top front teeth when I speak. This makes me concerned that my initial molds were not done correctly. My dentist thinks it's fine but I have not felt confident in this process from the beginning. I cannot speak without bubbles and spit coming out of my top teeth. It's asinine to think this is better than braces.