Those are called legs (the coils legs) not posts (for you they are hot legs). It sounds like you don't have your coil legs captured correctly or tight enough with the screws or you have not achieved an even burn on your coil. The legs of your coil should not ramp up and glow quickly or at all. The glow should start in the middle of the coil and work it's way to the edges.
There are really no shortcuts when setting up an RTA for vaping. Watch the video and do exactly the same thing, even burn no hot legs before wicking. Once that is achieved you wick, cotton should be snug but not to tight as it will expand a little once it gets wet. Prior to putting the cap on wet your wick and test fire it. Your wick should be completely wet all the way through.... drenched. Until you get the hang of it you have to take your time, follow the video and you'll be fine.
Start out with low wattage, since you are using a Clapton start around 15 or 20 watts and move the wattage up slowly until you get the amount of vapor you like, take your time, don't rush through it. Once you have it down you'll be able to build in minutes.
Good luck.