Hi there. I'm 72kg and have the 2019 Stingray 125 and Flow 1250. It's perfect! One tip I have is to make sure you are using a sufficiently small sail as you will be overpowered by the front wing area if you have too much sail!
I've also picked up a Flow 1000 front wing which I plan to use for more performance once I've progressed too confidently gybing the 1250 =)