Hi
@Fin and welcome to the planet.
ive not used this kit before so just a guess for now while you waith for others to advise.
looking here it shows works with 50/50 and high vg but doesnt mention 0.6 coil
https://www.ecigarettedirect.co.uk/vaporesso-luxe-x
what juice are you using and if its a push in coil are you priming it first by dripping juice on the air holes around the coil and letting it sit for 10-15 mins.
When used with the 0.4Ω Luxe X pod, the Luxe X kit is best used with high vg with a ratio of 70:30 or above.
When used with the 0.8Ω Luxe X pod, it is best used with 50/50 and nic salts.
by any chance are you using 70vg with the 0.8 coil as that will burn out straight away.