I have been using wordflood 1.2 for material for my wordpress blog for about a moth. I have entered a lot of words in and replaced and added some as tyme has gone on. When i re-write there is maybe only 50 words of original article left out of 400-500 word article.. The box inside says it has change 60%, but this seems very lo. How much % would be enough to be original and will search engines punish me for this amount?