This is also very true too but remember not all RDA/RBA are built the same, voltage drop on mods, the builds you actually put in them etc etc etc. i have many RDAs some with sub ohm builds other with stupid set ups that i got bored and tried and some where i just need a cooler vape around 1.2ohms. i use the same nic level across the board but i know what to build and in what mod/RDA to build it in. Its a very fickle thing but eventually you will always find what it is you're looking for. Best of luck!