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

i hope this helps.