well if that's the ratio you like then prob better to us PG based nic, as you will only be using small amount as you like 3mg strength and most flavours are pg based too so those together (depending on flavour totals) will add up most of the pg in your mixes.Just started looking into it . I like 70/30 vg/pg with 3 mg of nicotine . I have done only ten minutes on diy n hoping to forum can help with research , I did how ever fall on my first hurdle regards vg pg nice.