need help with juice

[decoy]

ok peps have calmed down a bit and these are my findings
can vape my own 0 nic homebrew
one of the lads at work has a bottle from them of 18 mg nic 70/30 vg /pg and i can vape it in his subtank no prob
i have used diff cotton,wire and coil heights but it still make me
but i can use the older 12mg berry burst in a gobblin at 40 watts at .4 ohm without a prob
i cant see it being the way i set up the coils but just incase it is the lower you position the coil the less harsh it is or have i got that wrong way round

im sorry for being a pain but never had this prob before(used to drip 22mg on a .2 ohm setup with out this bad a reaction did get nic rush but no )
its doing my nut in