Increasing AeT and “curing” ADS will make you faster on its own. As you improve, your body will be working less hard to go the same pace. By extension, for the same amount of work it currently takes you to go at AeT, you will be going faster for longer.
Adding ME or Z3-4 will help improve pace eventually, but if you’re slow at Z2 you have more room to grow aerobically. This long term outlook is what the books are all about. When you add in additional work also relates to your goals and when that goal is taking place.