"hide personal results" only removes the absolutely over-the top search results and returns you to the semi-customized results you would otherwise see if you're signed in.
If you've caved in and done the whole Profile-and-Author thing, Personal Results will spit out your own articles with your own picture.* Or, in my case, Leela's picture, but that is neither here nor there. I guess it's supposed to be gratifying; I find it infuriating. And insulting to the intelligence. Well DUH I'd love to see my own stuff filling the first 10 slots-- but I want to see it when some random person in some random location is doing the searching!
Turning off cookies won't prevent g### from noticing that you are using the identical IP and UA that you used yesterday. They just have to run the computer through a few more cycles.