I'm trying to think back to when I first started and it was definitely a learning curve as far as the draw speed. But, I do not remember getting a metallic taste. You're sure you have put enough juice in there right? When you do a little primer puff you should hear that noise in the Hanna video. I usually put 9 drops in there. If you are using an all VG liquid, that can definitely make a difference too. I've had best results with a PG/VG mix. Sorry bud wish I could be more help.
You guys are helping a bunch, it is helping me narrow things down.
I am using 70/30 pg vg. I am checking for the gurgle every time before I fire the button. Right out of the package(after blowing the primer out) I put 6 drops in, let it sit for 30-45 minutes to be sure everything was wicking properly. I checked the gurgle and it was there but ever so slight, so I added 2 more drops. At that point it sounded just like in Hanna's videos and the other review videos.
I have messed around with a couple more drops after blowing everything out(so 10 drops total), it was at that point that it really started under performing.
I hit it until I can barely hear/feel that gurgle anymore and this is when I will top up with two or three more drops. I think I have a pretty good handle on the fill level.
Flavor has improved ever so slightly over the last two days, so I have hopes that this taste will go away completely with enough time. The vapor production has not picked up though, but I am understanding that it can take up to 10 days to completely break in.