I'm finding the Vector to be superb... when the moons align. It seems very sensitive to any variable being off - coil placement, wicking, air.
For me, moving the coils up or down makes a huge difference and I'm finding them best just below the air holes - the tops of the coils even with the top of the leg hole of the center post. Lower, and I'm getting flavour fall-off and some harshness.
This makes for some long wick tails to hit the deck and you do not want to stuff the coils or you're in for some haboob-like (that's a thing, just ask the AZ boys) dry, gritty hits.
For air, I like it wide open, and I'm no cloud chaser. Close it down and the density drops, and, paradoxically, so does the flavour.
When she's right, though, man, it's a good vape.