I use the potv mix calculator and vapers toolbox. Covers everything I seem to need. I do like that I can copy mixes to the clipboard, here's what I'm testing toniggt.
Custard And Cream
To make 10.0mls @ 12.0mg Nicotine(Mls)
Base Nicotine - 1.7
PG : - 1.3
VG : - 5.0
Vanilla Custard - 1.5
Irish Cream - 0.5
Total Flavouring - 2.0
Expected PG:VG Ratio - 50:50
Actual PG:VG Ratio - 50:50
Its actually quite nice in my tayfun clone, but I'd step my flavours up to 30% unless I've got a cold coming on.....