Ohh well from my experience, i get more vapor and more smoothness using higher VG eliquids. I think they mute the throat hit a bit so you may want to up your VG and up your Nic level to get desired overall effect. I also think certain vendors liquids throw more vapor for reasons unknown to me (maybe pg/vg quality im not sure) Juices from Wordupecig and a lot of ones ive tried but not all from Nettmix custom vapes seem to throw a good cloud even with PG at 80%
edit: PS im a walking wordupecig eliquid advertisement, i got a sampler with my eroll starter kit of Red Full, and was so impressed i now have like 8 flavors and i love them all pretty equally. I get some very nice clouds with 80/20 PG/VG.
Im not sure if youve every tried ECblend but ive used them in the past, and they do have this "cool hit" you can add to your liquids thats not menthol. Ive never tried it though