Itshak I already did what you suggested. And you are right with what you said above. If I am able to compress the spring all the way I am sure better or same conductivity with using solid mode. I did it once and unscrewed the CT pin screw so that it pushes more the spring. And yes it does make a difference. but the pin would be a lot pushed and risks falling. you can always use a spacer also but that's not always safe.
From all this I figure what best to do with the 18350.
I tried this,and do some more,but already feel it drive better,
when battery push all the way down.
I screw center post of CT out,and connect atty to it,
and make sure the contact of CT is lower,by 1mm or 2mm.
Only then I screw it to the mod, (so it won't be able to edjust itself)
up to point it's a bit hard to make compleat seal,with the engraved tube.
Put the switch in higher position,
(When locking knurled ring is a bit below threaded tube of switch 0.2mm -/+ in open position)
And remove the SS cover of negative center post!
Hmm.. well it does vape better,finely.
Will see if I be able to stay on this setup for few days??!