Tacls 9060 to as 580 skates

[Gbhsk8 0]

I had tacks 9060s that i skated in for years, and wanted a similar stiffness boot so i upgraded to as 580s per having a better rounded toebox and less toe pain. The 580s might be too stiff for me at 170 rating. The 9060s have no rating number but speedcore1 stiffness, would this be good transition? Or should i downgrade to the as570?