I am personally against zapping a DE storage, there is no strategy in this but just an acceptance that you can't farm DE.
Frankly I don't understand zappers, they wait for 1 n half hours to create 3 lightnings and take away something which quite does not return the investment.
I tried zapping few players when I was in TH7 just to see how effective it is, and for me it din't feel like a strategy, its boring and it does not return your investment.
I did all DE upgrades when I was in TH7 without zapping anyone. There are other strategies that will get you more DE and keeping things more challenging.
I like your idea of revenge.



