The rba doesn't play well with high vg in my experience. Not sure if thats what you are using.
Depending on your build, 1.4 ohms can be a pretty high resistance to crank 20+w through IMHO. If not burnt, would vape pretty hot. Vape pens usually have a 1.8ish ohm coil and that is at like 8w or so. More details on your build could help. A normal coil at 1.4ohms is gonna take a lot less wattage than a clapton 1.4ohm.
Could try to close off the air supply a bit. Have found it can improve the juice feed on these type of rba's. Seems counter-intuitive to me, but I assume it increases the vacuum and pulls juice in through the channel/hole.
Also, poke your wick back in the juice hole a little bit.