I use 20 giants, 21 wizards, 1 healer, 3 healing spells
I sometimes three star when my wizards listen, but sometimes when I send my giants inside of the base the wizards dont go in as well and get distracted and kill the outside of the base and then I lose because giants are slow and wizards die.
You need to work on creating a funnel. There are some really good tutorial videos on youtube on how to funnel that you should check out.
This takes alot of practice you basically need about 30/40 archers, deploy your giants and healers to tank most defences then behind the giants on a line drop archers to clear the buildings(barracks collectors, etc) drop a few wizards (4 max) to help out with the clearing then as soon and those buildings are done drop King to tank and rest of wizards behind test where they are going first by dropping one wizard
Hope this helps
I think reduce the number of wizards to 15 and take 28 archers insted clear outside building with barb king and archers. Your wizards will go inside then.