i just want to share my new strategy for those people who are having difficulty farming.
I'm no longer treating bases individually. I now treat storages individually. I'm using as few troops as possible and mix them with my heroes. Most bases have 1,2 or 3 storage who are not well protected and i take them without letting my heroes die and not using spell most of the time. Any loot from the collectors are just bonus. I can take premie bases,dead base, or just take some storage from a strong base.
Army composition 8 wallreaker 8 giant 30-40 archers 10 hogs 1 golem (i use it for strong bases) Heroes 70-90 goblin