Have you taken a look at this?
http://puzzleanddragonsforum.com/showthread.php?tid=17250
I think you should focus on evolving your Kirin and Echidna to get some more HP. I started to do so around that level. It is 100% possible to get a dub-mythlit, just takes patience and maybe some stones. Gather the other necessary mats the rest of the week! I used a friends Awoken Odin to get the necessary keepers. This protected me at full health from getting one shot. If the two bosses were on the same timer I was kinda SOL though, hah, so I had to redo a few times if I recall. I would drop that red/blue guy with 724 hp in favor of a Blazing Ice Ogre like I have. That's an easy HP and attack boost. 724 is too crazy crazy low! You can pretty easily get the blue ogre from the second technical dungeons and just ult evolve him.
I'd also drop the red dragon for a dub-Amelit or dub-mythlit to get some purple damage going. I don't think you need so much red as you need at least some dark in the early goings. I really want to use a keepe of dark but the team cost is too high for me atm.
Here's my team for comparison. Not perfect but getting the job done while I level and try to gather the rest of my team.
You should do level 3 of tower of giants over and over on weekends til you hit about rank 95. It will give you more team cost and stamina to work with, and at your rank you should be able to farm it nonstop. Otherwise, you need to start working on a team to do descends like 2 heroes and hera so that you can get some important utility mobs for your kirin team. One thing I would recommend is trying to farm some ripper dragons, they are useful for their orb change nuke and their 50% elemental resist. Those should be your short term projects for now, and once you have a strong foundation for subs, you will notice that you clear dungeons much easier.
Thanks guys. This will give me something to work towards. I appreciate the help!