+1, exactly what I do: I also use NanoTechs and just never charge them over 4.2A/1C... The edge is off them, but they're still working fine
And to extend the lifetime further, don't run them until your ESC cuts off, just 5 minute runs or less, and store them at +/- 3.8v/cell (just make sure to not store them fully charged, nor empty).