All advice given by the Monkey on this board is caveated with "I wasnt there,and I dont have tape"
But
It sounds like you werent picking your angles to cut the ring down,and were just pursuing.
You have to work the angles to get better shots in,see tendencies where they circle to,and have your fist there when they get there. Since your a southpaw,if your going to press,press their power hand,not their jab hand,you cut off the jab hand if you do that.