Hi, I am new to diy and am trying to mix some geoffs blend from TV. I ordered 4oz doubler of geoffs blend and I have 48mg of unflavored nic juice. My question is, how do you know what percentage of flavor to use when mixing? Is there a guide to this. I am using the e juice calculator and am not sure what percentage of flavor to plug in there. My geoffs blend is all PG and my nic is pg base...Any help would be appreciated