Nah, I dont have any sweet spot in heroes' level. I just like to max everything up before advancing to the next THs but looking at the DE troop upgrades, I might skip it for TH8. Lol.
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Minions....seems like a no brainier! I do really like Mr T but only because he is Mr T.... They should work in "I pity the fool" somewhere and maybe I'd upgrade him first :). I love the minions. They don't take my elixir which I never have enough of and if you send them in a swarm (er...2 swarms...i send in the first to take out ballons...poor little guys dont stand a chance...) anyway... they can take out just about anything. I heart them!
I haven't even built the DE barracks yet. My DE is for my BK which is currently at level 5 (th8)
Although I love Valkyries on my CC for defense, minions are the ones I see myself using more, due to the low cost and short training and upgrade time so it's the first one I will upgrade when my BK gets maxed to level 10 (currently sleeping for 3.5 days for his lvl8 upgrade).
I will do minions as possible, I might leave valkyries at level 1 until I get 2 level 6 drills to keep the DE build cost down. I can see building 4 level 4 valkyries as an alternative to the 6 giants I normally use to speed up army build time.
Don't think ill even build dark barracks