to decarb or not to decarb when making oil for a vape.

I am completely new to this but figured I would try my luck.

I recently tried my hand at making an oil for my vape. I made a tincture with 3.5 g mj and everclear. I did not decarboxylate due to mixed instructions. Some said that the vape process will take care of the process of decarboxylation, some said I still needed to. I opted to not do it since it made more sense to me. I have two questions. Do I need to decarb before making a vape oil?

I followed the QWISO method on this post:
https://www.reddit.com/r/vaporents/comments/1sjj1r/four_different_methods_for_making_ecig_juice_in/

If so, is there any way to recover? I now have about 5 mL of oil, but not very strong. Any suggestions are appreciated. I was thinking about using another 3.5 g to make more potent, but I definitely want some guidance as to where I might have gone wrong.

Thank you

decarbing plant matter 'prior" to extraction not necessary ..... but decarbing "after" the extraction and prior to mixing with a carrier oil is most definately beneficial.