Javdet
I usually don't fail in battles, but I still lack experience in building chains.
I have a lot of experience in battles against the computer (I've been playing for several years), and I've openly told the judges about this. I can calculate the battle several moves ahead, even before attacking neutrals, but I have little experience playing against a human, and this accordingly affects decision-making, building chains, and deciding where and when to go.
You're talking about smart objectives? Is it unusual to defend secondary objectives and take a hidden location? Have you noticed that out of three games playing Inferno, I only summoned demons once?