Can't get my head round this. I've just mixed some left over home brew ry4 double with 10% concentrate with some homebrew banana custard which is banana cream 10%, sweet cream 2% and custard 8%. I mixed the two together 50/50. Am I right in thinking I just divide all the flavourings by two then just add them to my pg, vg and nic? Found this quite a nice combination and fancy some more lol. Thanks in advance apes!