PM the APV manufacturer.
Some juices are worse than others, but there are 2 main causes I've experienced..
1 - Coil is too lose on the wick (they shouldn't be "tight" but touching), and the liquid boils instead of vaporizing
2 - It is over-wicking causing the same problem as above.
If the coil looks good, firing at your typical vaping angle with the top cap off will give you a really good idea as to what is going on. If its overwicking, pinch off the very top of the wick, or reduce your angle of attack..