Just thought I would put in my 2c. I believe your increased dreams and the more vivid nature of them are simply a natural reaction to quitting your addiction. Even though you are vaping, you are still getting less nic, and also the physical action is different (how you move your body when you vape assuming you are not using analog a likes). What you describe is extremely common in drug addicts (bad comparison, but bare with me chemical addiction is chemical addiction).
By quitting analogs, you have messed with one of your body's coping mechanisms, the dreams are a result of your changing brain chemistry as your body adjusts (it's essentially your subconscious fighting back). It's not even just the differing nic levels, but your brain has to handle stress and other outside stimuli differently.
As your body gets more accustom to not smoking, you will find the dreams will become fewer and fewer and further apart. You may also even notice you may smell the exact smell of a cigarette from time to time, when you are some where no one has or is smoking. This is just part of the withdrawal process. These things can happen as long a year later and the scent thing may come from time to time beyond that even up to several years (it doesn't happen in everybody, but it is common) although the longer you stay away from cigs, the less often you should notice them.
You can try reducing your nic level a few hours before bed, however I doubt (imo) you will notice that making a difference. I was reading a study by the leading greek ecig researcher (I can't spell his name
) had done recently about the nicotine absorption levels of vapers. The result was that the average vaper, would have to vape 18mg ejuice for about 35min to equal the same nic absorption of 1 analog.
Anyway, I Hope this helps. Keep at it, it sounds like you are doing great!!.
Dreams are way more vivid....
