Whenever I see my father he likes trying my vape but is never satisfied with the 3mg/ml I have in my tank or rda. Personally, I've never had the need to go past 6mg/ml. For Christmas I'm going to get him a 30W mod (also open to suggestions) and juice for his Subtank. What do you think he would like coming from analogs? I'm thinking either 8mg or 12mg. Would this be too strong in a Subtank at ~20-30W?