How do you know you're 3-4%? Have a look at my back shot, does that mean I must be like -2% bodyfat??
What exactly is your goal? To be like something off the cover of Men's Health?
To be 70kg at 6' is just plain scary, on the verge of anorexic school girl even..well maybe not that extreme, but still 'skinny'. You then mention you're bulking to get to 86kg at 6', and on a cycle, and then cut back to 84kg? Are you sure you've done you're homework?? (Unless of course your goal is to be on the cover of Men's Health...what a waste of gear...85kg at 6').
Anyway, how much do you lift? (SQ, BP, DL, MP..etc?)
I gave you a 2, only because I don't share your desire to be a tumble weed. At 5'5 I want to weigh at least 85kg (one day lol).