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@Dammit
They changed the actuation ratio in the latest round of upgrades- (from memory) they reduced the mechanical advantage of the levers and increased it at the caliper.
This means that old style Shimano, or any SRAM or Campag levers when combined with the new calipers are, in Shimano's view, "too strong".
Basically, you'll have more power but less modulation I think.