Having more than one curl type on your head is normal. Some people have more than two.
The way of getting round it is to finger coiling, twisting or use things like rods to set your hair. In other words you will need to spend time manipulating your hair as just applying a product won't work.
Alternatively you can just live with it and when people ask you questions or make comments just give them a short answer.
I do the latter when people "kindly" point out my curls are different sizes on sections of my head.
My hair is the same.. much curlier in front (3a) and wavy in the back (some days it's 2a/b, like today). I've never gotten stares, maybe you're just paranoid? I don't find different curl patterns to be odd, it's very normal. Hair does what it's going to do. Do you have layers? Is it shorter in the back? That's mainly my problem. You could pin a small portion of the front back, and that might help break it up a bit. Try different styles. Also, you might want to try a different hair cut.