Softer springs will give you more RPM, less torque and in theory less comm wear. In practice you might get more from the brushes bouncing around and arcing, you won't know until you try them.
I'd advise against the enduro brushes, whenever I tried them they were much harder on the comm, the brushes lasted longer but I was skimming more.
Another thing that worked for me was to turn the timing down to one notch and gear up a bit, it made the powerband much wider and smoother, even if the outright power wasn't quite as much as high timing/low gearing. A benefit of the lower timing was much lower motor temperatures and less brush/comm wear in general.
With the sprints and lower timing in the 4wd I was getting 5 runs with a 9x1, skim, then 5 runs and skim/rebrush. So long as you keep the temperature down the sprints actually last ok, if you get them too hot the lubricant in them burns very easily and they start killing the comm.
A good indication of if they're knackered is how smoothly they move in the tubes, if after a run they are lumpy and stick when you pull on the braid they need changing.
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