5% < 10%, last time I checked. Also, "Bitcoin did something fishy" should be a reason to invent some thing less fishy, not more.
The other option might be a blockchain that doesn't do time based payouts but does volume based payouts. Rather than having blocks issued on fixed intervals you could have them dynamically issued and computed based on the previous blocks time to reach a calculated size threshold to hash. Unless you were psychic and could guarantee your coin would take off, investing the electricity to generate bogus volume would be a tremendous gamble in resources to try to beat the market.