Hmm, when resistance drops I usually think short. I typically start a few points below baseline (I always check resistance on a bare new coil to see where it is supposed to be) with a new coil and then slowly come up as the wick seasons. Is the flavor and vapor ok? If so, I'd "just vape it". If not, I'd give the wick a quarter turn to see if it moves the coil onto wick space thats better oxidized (and brings the resistance back up to starting point). Also, make sure your wick isn't touching the bottom of the tank and is trimmed to the top or just below the center post height (little SS hairs can make shorts to the tank bottom or top cap).