Change in the Looting system?

Hi just wondering if someone could explain how the looting system works and how much off a % I can loot from attacking TH above and below mine(th7), now I'm a fresh TH7 and I know first hand and reading posts on this forum that SuperCell in that last big update did a spring clean off inactive accounts but now when looking for a village to raid I'm now spending up to 50-60k gold in next fee's only to find a now decent base worth going for and by now decent I mean prob 110k each in gold and elixir(not dark elixir) but that's only after spending half that gold on next fees.
Now did SuperCell change the loot system in the last update cause I know attacking someone with a TH lower then mine I get a lower percentage in resources I can loot and that I can only loot think it's 20% from storages and 50% from collectors, but I'm coming across bases that are TH8+ and looking at what they have stored in them and the loot from them prob wouldn't even cover my next fee and what it would cost to build my army.

Supercell did not do a "spring cleaning" it's just that many people came back to the game.