Interesting. Just for a 'for instance' say I'm making up 12mg of Platinum Ice/Aqueous Glycerine and wanted to try some Flavour art flavors. How much Ethyl Malto might you add to a 30ml batch? Would you boil it in water first - add it to the VG perhaps to make up that part of the blend then mix in the nic and flavors?
It's a bit less soluble in VG than PG, but I always just add it directly to the juice - give it a gentle heat (pop the whole bottle in a bowl of hot water - that's easiest,) or leave it overnight, and it will dissolve quite readily.
try 2-5% w/v (eg: 20-50mg/ml = 600-1500mg/30ml bottle,) and you should find it adds a pleasant freshness to most juices, and enhances other flavours.