hey nathan i have the same size symetre and the 18000 spheros and can tell you they are both awesome yeh the symetre can handle kingies and i agree with ur statement of it being able to handle 9-10kg of drag but let me tell you, you feel alot safer having one on the end of the spheros 20kg of drag just allows you to smile abit when you know u hooked something big instead of having to thing ****** why on this reel