That's why you hate dungeoneering. Don't even step into a dungeon until at least 50 DG, because teams are the only reasonable way of training DG and below 50 DG nobody will be doing C6 large floors. Use Tears of guthix and Penguin points, as well as any XP lamps you come across until 50, then begin your dungeoneering experience. I trained the lower levels by doing C6 smalls with one friend, going to medium on my top two floors. The XP was not very good, but I wouldn't say to not step into a dungeon before level 50. Doing some floors also helps you understand/figure out how to Dungeoneer properly.