Voltage drop on Requiem BF Kit

Hi guys!

I have bought a Requiem BF kit and I don't know if it is working well. I'm using a Sony VTC5a which is charged and gives 4.15V. When I fire it and I measure with a multimeter the atomizer it gives me 3.6-3.7V. (I'm using a 0.28ohms coil). Is that normal in a mech mod? It means that I'm vaping at 3.6V and when the battery is low and gives 3.7V I'm vaping at 3.2-3.3V? Thanks!

Original source: https://www.e-cigarette-forum.com/threads/voltage-drop-on-requiem-bf-kit.967201/