Th7 Farming help!

So I am in TH7 and I'm having some trouble farming right now. My general army composition is Barch having slightly more barbs than archers with a limit of 180 units right now plus the Barbarian King. I can easily 3 star TH6 bases by closing my eyes and simply spawning my units, however I have trouble with TH7 ones which I need for DE and more resources. TH7 mortars and Wizard Towers simply crush my whole army, and normally I can't even get to the storage, so I only farm from the drills. Anyone recommend me another army composition? I was thinking about trying Garch, but might as well ask here first.

Troop Levels:
Barb, archer, wizard: 4
Giant, goblin, balloon:3
Dragon, healer, minions: 1

Spells:
Heal: 3
Lightning, Rage: 2

Yo if u really want dark e get lvl 4 lighting spells and start dropping them on ppl of not use about 10-15 giants 4-6 wallbrreakers and the rest archers/barbs with more archers than barbs also bring 2 lightning spells to take out any mortar inside the base and assuming tht u have a 3 spell spot either rage spell for once your in there or heal spell to heal up the Giants. Make sure u pull out all clan castle troops and always put one dummy giant to test for spring traps etc Thts what I did good luck