lightning strikes or this
https://www.youtube.com/watch?v=_cbej4ZLoW4. the video recommends not attacking any th8, but those were the easiest to attack and not everyone is going to be able to revenge you. only 1 every 12-16 hours. the gains of attacking a th8 far outweighed the losses, in my opinion. i started finding a lot of de at about 1400-1450 trophies and it was relatively easy to take until about 2200 trophies. btw my bk is now level 5 and hogs and minions are both level 2. took about 2-3 weeks to do all of that but could have been quicker if i had more time.