[Ask][A9] I hate my decks! How to progress through Jungle Arena?

I've gotten as high as 2952 but then get killed and drop back down to the 2600's man, it sucks! Using this deck usually keeps me afloat, but fucking Inferno Tower decks abound and are hard to deal with: 2.8 Giant (8), Bomber (10), Skeleton(10), Baby Dragon (5), Minions(11), Zap(10), Ice Spirit (10), Cannon (10).

I tried this deck I found online and have a similar success rate but is really not getting me any farther: 3.6 Skarmy (5), Hog (7), Princess (1), Gobling Gang (10), Inferno (7), Rocket (7), Goblin Barrel (4), Zap (10).

Beyond that I have gone online and looked for the "best decks" and watch videos for them, but in practice I lose hard. I can't tell if the decks are actually fine and I just need to practice with them. Like this one: 3.0 Hog(7), Executioner (1), Tornado (4), Zap(10), Valkrie (7), Fireball(6), Skeletons (10), Ice Spirit (10).

I've never had much success with heavy elixir decks so usually go for the lighter ones. If anyone was in a similar boat and got out of it I'd love to hear some suggestions.
Thanks!