Yea theres a thread on that im sure you can do it. As far as flavor if its an extract then yea maybe a drop or two. Ejuice of any kind id imagine youd need more.
Yea 1:1 is the baseline they give you on the bottle but i always mix a little heavier on the ej. Maybe 1:1.5. The thinner you mix it the bigger your clouds for sure but your potency will drop off. I will say though I have never gotten serious clouds either but I dont mind that since I use mine in situations where stealth is outweighs clouds.