Hi Fefe, welcome to pjf, you have chose the best size for you, as 80kg springs are 15kgs over your weight, and will be good to use, as you will not be hitting the bottom of the springs, as easy as you would on a pair of 70kgs springs.
I am 63kgs was using 70kgs springs, broke them then went to 90kgs springs, and find the stiffness better to use for gain height, so I would use the 80kgs model, as it will be good to learn on, and getting your technique right, and PoweriZers, Pro Jump, Air Runners are made by the same company, called Flying Locust