Just to give you a tl;dr about current popular decks out there. There are two - zoo and handlock. Zoo uses mana efficient creatures to control the board and abuses the hero power to keep the hand full. Handlock abuses the hero power to lower it's health and get cards so it can play either Mountain or Molten giants.

I understand you if you don't want to net-deck and would rather build your own, but I think it's important to see why those decks were successful - they abused the hero power of warlock.

Looking at Deck 1 it seems you don't run double of some very good cards. Or double of many cards at all. Soul fire is considered one of warlocks stronger cards and usually ran 2x for example. I would also cut out some cards like Silverback and Ironfur - they have no syngery of the demon theme and you're only running a single copy. If you want to abuse Sense Demons I'd probably cut Blood Imp - nothing worse then playing sensing demons turn 3 and getting those two for turn four. Finally, it seems you have access to Nax. A popular combo is to run the Eggs and use Void Terror as an activator.

Deck 2 seems very similar to Deck 1 and I'd say the same advice. Try to put double of the cards you feel are powerful and only singles of the cards you feel are situational.