I think
@CashNVape meant that it is 60A in total at a 0.07 Ohm resistance, not per battery.
The load is shared by each battery in parallel as we know, I do think there may be a little confusion here in regards to series/parallel and how they act in regards to amp load.
With a 25R, in a perfect scenario then your 0.2 figure is about right (it would be 0.21 to be dead on 20A at 4.2V), with a parallel build you can go lower than this safely though due to the way parallel set ups work.
I am not really a ultra high power mech user though, my builds are usually 0.25-0.3 on a tube mech, and that is plenty for me. I do go higher wattage wise regulated when I fancy it, and also if I am using a series mech, I find 0.65 to be the sweet spot for me.
@whiteowl84 , I think 0.15 would kill me on a series mech, that is if the batteries didn't first lol!