to answer the op, I have used ejmix, 1:1:3 ejmix,bho,plain pg or random 0 nicotine ejuice, with no seperation so you certainly can dilute an ejmix/bho mix with pg or 0 nicotine ejuice without it seperating, 1ml:1g:3ml is as far as i have pushed it though. i see no reason to use anymore than 1ml...