That gross funky metallic taste is indicative of a short or hotspot somewhere. There shouldn't be any metallic taste when the coil and wick are working properly. I think this is why some people don't like genesis devices, as you can wrap a decent coil that looks good and performs well, but will have a small hotspot somewhere and cause off-flavors. Not knowing this is an actual issue not just the standard genny flavor, some people just get a bad opinion of mesh.
To attempt to find the hotspot, you can fire the atty with the top off continuously while blowing slightly on the wick. This should closely approximate what happens when you take a vape, so do this for 10-15 seconds and see if any part of the coil starts to glow. A properly functioning genny should be able to fire continuously like this without ever drying up or having any glowing coils. If you see some part of the coil that quickly glows, that's your hotspot. Try to look closely around where the positive and negative legs meet the wick. Also look at your wick sideways to see if there are any coils that look to be sticking out further than the rest. This could be a loose wrap also causing a hotspot.
Whenever I have had a funky taste this method always revealed a section of glowing coil somewhere. You can either try to wiggle the coil around to work it out, or dry everything out and pulse it on a mech to fix any shorts. All shorts are hotspots, but not all hotspots are shorts, so even if your resistance is stable there could still be hotspots lurking around somewhere.