Finishing Lower Than Where I started

I started the quest ranked 934 and ended it at rank 853. So that's an 80 rank drop after the quest and I have to admit that it was one of the more frustrating ones because I thought it would be easier by now.

The Earth quest with Obsidian doesn't seem to be going so well for me even adopting a double healer strategy. For one, it can be neutralized with a Thaddius and if you put a creature like the Bone Golem which can then absorb all 1 magic damage and then even with a double healing, once the front line attack is taken out, the healing doesn't matter.

For all that trouble, the rewards were pretty sad. 7 credits... not even double digits today. Not sure if I will even get to Silver I at this rate. The next couple of days will be key to getting there.