Having trouble with Kanger Nebox RBA - Burnt taste???

[JustYourAverageVapeGuy]

Hey all, I just did my first RBA earlier today. I used one of the pre-made coils and the cotton that came with my Kanger Nebox. I made sure to prime the coil, and the cotton is saturated all the way through, but I have a problem: I'm getting a horrible burnt taste. I got a few good hits with no burnt taste at first, but now it is constant.
I am vaping in wattage mode at 25 Watts, and the coil is reading 0.57 Ohms. I have used pre-built coils at 25 Watts with no issues before, but I don't remember the Ohms that those were at. I can vape without a burnt taste if I go down to 15-20 watts, but then I have little or no flavor.

The juice I am using is 80/20, and here is a picture of the RBA before I primed it:

 

[Lefty]

Once it's burnt it stays burnt. Only thing to do is try again. There should be some resistance when pulling the wick through the coil but not too much. The wick should cover the feed holes but not packed too tightly, especially with high VG. There needs to be a clear path to the sides of the coil, between the coil and the screws, for air to pass freely. It will take a little experimentation to get a feel for it.