Ok so with certain flavoured concentrates I'm getting really harsh hits I can only assume it's the certain flavoured concentrates because I have one recipe that works really well nice smooth vape but all others tried just a awful hit (very scratchy peppery) but say like I add a bit of raspberry in the mix it gets rid of that and end up with a smooth vape but not giving me the blend of flavours I really want any one else had this problem and simply solved it or is it just trial and error ?