The Tron comes with the 1Ω head installed, it uses the ego one CL replacement heads.
It includes one .4Ω Ti & one .2Ω Ni head, these are for use in temp control mode only.
Use the 1Ω head in power mode/watts, use the others in the appropriate temp control mode Ni / Ti.
The resistance should be printed on the side of the head. Or small air hole through the center = 1Ω, large air hole = sub ohm resistance.
The head must be thoroughly primed before use or the wicking material will burn/scorch, after being burnt it must be replaced. It will never wick properly & most likley give a burnt harsh taste.
Prime the head by dripping drops of liquid on top of screen in head until wicking material is fully saturated, then install in base, fill tank, thread together, take a few unpowered primer puffs.
Start off at a low power setting & slowly work your way up taking a vape or three on each setting until you find what you like.
What is the Pg/Vg ratio & nic mg/ml of the juice you are you using?