Believe the 2000mah AW IMR is like 10amp continuous, 15 or 20 amp burst peak output where 1500mah is 15 or 20 amp continuous with a 20 or 30 amp burst peak. There are several things I don't have the picture of about your setup. My mechs I generally use for dripping, rebuilding, and dry firing attys. Lowest ohm device I put on them is my Igo-W which has a dual coil, 32ga (iTeo Nano Dragon Coil config) with 4 wires in parrallel (2 wires per coil (not Twisted)), at 0.65ohms. At say fair voltage output of 3.9 most of the battery charge that is 6amps @ 23.4 watts output I am asking out of a battery. I do own the same AW IMRs and that battery has almost double my amp requirement to fire that Igo-W.
Now another configuration, dry firing my Protank heads clean at 1.5ohms, I ask 2.6 amps output, there the Samsung would be all I would need to run my Protank. It's not that those Samsungs can't be used, most people using mechs that I encounter are sub-ohming on a RDA/RBA/RTA device.