Yeah, there's a ridiculous amount of options, but to simplify it, it's really all about voltage drop when you pull the trigger. The higher amp draw the tool needs, the more it will benefit from having a 2P/3P vs. a 1P battery. The HO batteries may put out a higher nominal current per cell, but in the CP batteries it's at the expense of fewer cells, so more voltage drop. That's why the 6.0 HO and 8.0 HO batteries do so well, because it's the best of both worlds - cells that have a higher discharge rate, as well as a bigger pool of cells.
FWIW, my 2962 Gen 2 Mid-torque lives with the 3.0 HO battery attached, just like you use it. When the rare occasion comes that I need the extra uggas, out comes the bigger batteries. But I'm not lugging that extra weight around when I don't need it 99% of the time...