[NuLLKiLL]

*king* that is weird! After you disabled google sync did you add the good pictures back in? Did you notice when they changed again to low res? Did you reset the phone? Do you have any 3rd party program installed that might be interacting with your contacts or email?

I'm not trying to imply you did or didn't do something just don't know what is causing this so all I can thing to do is ask questions and hope to stumble onto the answer.