That's the annoying part. If you level one up you pretty much have to catch some others up too. Otherwise all the enemies in the dungeon will be set to your top dragon and you'll have the rest several levels below. I kind of squeak by with zapping the enemies with Wind and then putting up Earth shields on my team, but it gets tricky sometimes. Easier to have everyone close to the same level but dang that food gets expensive.
I don't think I can add you as a friend in Dragon Mania Legends with the Xbox ID. Do you have a Facebook? You can PM it or add me at https://www.facebook.com/gid.goh It's an account I made just for the game.
I breeze through the dungeon every day, that's why I don't want to mess with any of my dragons. I have two teams one is 28/29/26 and the other is 26/26/26. I use the first team if the average of the enemy dragons is around 29. Otherwise I have no problem beating anything else with my 26s. I don't even come remotely close to losing any matches.
The key is having the right combination of dragons. My first dragon casts shield the first round, then wind the second round. Dragon 2 & 3 both have lightning to remove positive buffs from the enemy. Dragon 3 has remove negative effects healing to remove bad stuff from my dragons or heal them up if needed at the end of each round. Second wave gets blasted with dragon fury then I finish them off with a couple of mass attacks. Ridiculously easy. Make sure your dragons are maxed out at the academy. All six of my dragons have level 6 skills across the board. Level 6 poison infection also comes in really handy.
I just sent you a facebook friend request. The problem is that I haven't been able to see any new friends I add in the game. I think I've added so many that the game doesn't recognize them anymore. I feel bad for the people who send me daily gifts and I can't reciprocate. They must think I'm a jerk.