small suggestion - get an external battery pack.
with that said 1/32 power shouldn't have drained that much power.
i have 2 600s and the st-e3-rt and tbh i haven't come across the same issue as i tend to have 12 batteries running into my 600's - assuming the draw is slightly higher then the 580 II's I replaced, i get about 2500-3000 shots a magazine as well as instant recycle (and 1 sec 1:1).
the funniest thing that happened with my kit was the master over heated after 700th shot shooting a poorly lit catwalk. lcd went red and i didnt know what the hell was going on lol