Few of my articles are having good traffic already, between 50-100 visitors per day each of them. However, after I have installed the 'wordpress seo' plugin, I noticed that, from its status, my articles are showing 'OK' for seo, not "Good" . So, if I now go to modify those articles a little bit to make up a 'good' seo, is there any chance, with bad luck, it get hurt for the existing seo and decrease traffic instead of increasing? Any suggestions/alternative approach are welcome and appreciated. Thanks.
If need to edit something I do it. I haven't noticed any negative impact from Google for doing so. The better edited the article the more likely it will rank.
If your articles are already receiving good traffic then why are you going to modify, traffics are very hard to gain, don't disturb your traffics, I would say.