Hi ,
1:1 ratio will knock your socks off , 1:2 will still produce good results anymore dilutes the spice too much , much better to get the desired effect from one or two pulls rather than 6 or 7 ...I use an rda with 1 ohn coil at around 15 watts .
I also find that the more you can get in you the easier the journey you have , you sort of give yourself totally to the spice , you're helpless have no choice but still lucid of mind if that makes any sense & the rewards are spectacular , the lower end scale of experience is more uncomfortable than the full on breakthrough experience for me , it's just a matter of overcoming the fear & going for it