I know crystal 2 is hard (for TH7[and lower]), try C3 or G1 at least. As for your decorations, just keep on selling and rebuying them. And why do you have limited time to get ur DE upgrades done?
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As a TH7, you should bring along 3 lightning spells and use them when you see DE over 2K. People will tell you here that you're scum, but who cares. It's a game, we all get zapped. God luck with your DE journey. The BK ability is definitely worth it. Helps a bunch in raids and wars.