Longer steeping for the flavoring to propper disolve/blend in. Adding distilled water help also as stated. Some add a slight bit more flavoring and others dosen't, so you will have to see for yourself. I myself find that pg really brightens up e.g. fruitflavors, so maybe adding more flavor would compensate for that, but again I dunno... Firstly, at least, try the prolonged steeping...