I might have missed it, but the lines should probably be defined in a popup somewhere. If it was I missed it. I'd like to know what all the random white/red lines mean.
The white lines coming from an enemy is basically it's awareness range. Get close enough for the line to touch you, enemy notices you and attacks.
Red line connecting to you is an enemy that's aware of you. Usually pursuing.
As for the Cloak, sometimes I wonder if it's a bit OP; alot of parts of the game lose their challenge if the awareness is reduced too much. Even on the highest difficulties, I'm finding this is the case. Certainly JtP missions in particular become easy as heck.
And the Stealth missions..... it might be a good idea to rebalance those. Even without a cloak enchant equipped, the awareness range of enemies in those missions are SO low that you pretty much literally have to actually crash into them before they'll start attacking. Right now, it's one of the easiest mission types.
And "hidden" enemies like the Lions are easily found just by wearing one of those enchants.