"Best of the Best" Tournament

We have 20 participants. I will do the draw today or tomorrow, and we can start playing. Registration will be open while the first round lasts. What should we decide about the tower in the Dwarf Castle? Should we ban it or allow it? Today, I tested the Diamond map, and it didn't seem too bad to me. Should we change it to another map or leave it as is? If we change it, which one should we use?