Not to be mean, but I think you need a new vocal coach. Whoever you've got now isn't really helping you overcome many of your issues.
Look, the same thing happened to me with guitar. I had a guitar teacher who, at first, taught me exactly what I wanted to learn -- powerchords and some pentatonic scales. 2 years into playing, that was still all I knew, while friends were racing ahead of me with their expanded knowledge. I had to get a new teacher, to open my eyes to broadened avenues of playing. I sitll stink at guitar, but at least I have a much stronger foundational knowledge of it now.