It's not easy to guess and I'd hate for you to order the wrong density based on my recommendation alone as I'm by no means an expert. However, I ordered 60% and i have similar side hair to you, although I have mine longer. It's a bit of a stab in the dark and you may just have to order a certain density and see how it works. Bearing in mind hair systems lose hair gradually through shedding anyway... my point with 60 as opposed to 55 or lower is that if its too dense then there are ways to make it lighter. If you go with 55 and its too light then you can't make it denser.