I'm not an expert on warlocks tbh, but after reading the tips, and watching your two newest updates, I noticed that you are still not using Havoc, you also don't use the Shadow Ward, or the shadow/holy damage absorb spell, that could have mitigated quite alot of dmg from the retri paladins, and from the Aff lock, Spriest combo.
You also still burn all your embers, leaving you with none left for emergencies, like an extra heal, or that final Shadowburn, should you get someone low (wich btw, might have earned you a win, vs the druid and paladin combo).
Now, to the positiv stuff, you seem to have picked up on what people have told you, and you are definetly playing better in the last 2 videos, just keep it up, and you'll have tons of fun
Cheers!