Cool, yeah sounds like Vapors tongue. Few tips there, if you can handle Spicy stuff, it helps. Mouth wash, Lemon works, basically try to shock your taste buds. Lots of water helps too (and remember for health reasons, half your weight then drink that many ounces is the suggested amount of water, keep hydrated!). It's a major thorn in the side for vapers.
Anyways, yeah it's always a fickle bitch to nail down wicking on RBA's especially. Too much wick and you'll choke the flow and not get enough. Too little and leaking happens. The key is to have enough and fluff, yay rhymes. Cotton does an amazing job of pulling juice to it, you'd be surprised how little is actually necessary if you fluff it and set it properly. I just wicked my new Griffin, I had less than a centimeter of cotton coming out of the coils, fluffed it and tucked it down into the juice wells, and while I got an initial bit of leaking when I filled once I pressurized the tank (tanks work on a "vacuum" system) the leaking stops, refilling I just make sure to fill quick, then start vaping to counteract the lack of pressure and boom after a few pulls it's golden.
With proper wicking you can turn the wattage up a bit, meaning more vapor, more flavor.
One last suggestion/recommendation, try twisted builds. Strait wire heats up much faster than twisted, and it doesn't stop heating up. Meaning a long pull can lead to scorched cotton. Twisted heats up slower and takes MUCH longer to get to the overheating stage, also providing more surface area and better flavor through more vapor. Just something simple that I loved for a long time (I've moved on to a bit more advanced builds). It's really easy, you just thread some wire through something you can twist, clamp the ends down in some sort of pliers and twist the thing you threaded it through (something like a coffee mug or my favorite an actual paper clip, not the trombone things but the actual clip).
Anyways hope that Vapers Tongue goes away soon and you keep building, saves money and with proper work it's far better than premades which IMO suck because of inconsistency of mass production (god I hated getting a dud coil SO much).