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I suggest revising these items for clarity (and I'm guessing on the first one)

    Calculate hardLimit by examining the coinbase scriptSig votes of the previous 12,000 blocks, and taking the 20th percentile.
    A new hardLimit may not increase or decrease by more than 1.2x beyond the prior hardLimit.

to:

    The new hardLimit is calculated by sorting the coinbase scriptSig votes of the last 12,000 blocks from lowest to highest and using the vote of the 2400th block.
    If the vote of the 2400th block is a change of less than 20%, use it as the new hardLimit.  Otherwise, change the hardLimit to be closer to that vote, to either 120% or 80% of the current hardLimit.

I don't understand #5, 75% rule.  Shouldn't invalid version 4 blocks always be rejected?

notplato
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