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I had pretty good luck with the EF7 motor that came with the Corona. I threw a winding early on but LMH replaced the armature for me. After that, no more problems. I did experiment with some other brushed motors and found some clearance mod motors at Sheldon's for $10. ea. One was a 15T/S motor which worked very well and very was responsive. The other was a 14T/D motor that worked equally well.. The only bad experience I had was with the Atomic Force 17T/D motor. It just couldn't cut the mustard with 7-cell battery pack.
I think the reason you'll see a difference in brush life vs. your A10 is due to the high current draw for sustained periods in the heli. It's pretty hard on the brushes.