The atty may have primer on it, which needs to be worked off. Running a couple quick 3 sec dry burns might help, but otherwise, yes, that residue will go away. Also, depending on what Ohm your LR 306 is running at, the loss of flavor may be the cost of the higher heat it produces.
These attys need to be treated with kid gloves at first.
Put your drip tip of choice on, and put 4-5 drops in, and let it sit for a while. Do a couple second clicks on your
device to activate, then add a couple more drops. You should be good to go. As soon as you notice a flavor/vapor dop, add a few more.