It might be my tires, we'll see how it goes after I put the FD wheels on.
If it's your tires, you should be able to at least chirp/screech your tires a little by braking hard @ 25mph like amaff said. In which case, better gripping tires will fix that. Otherwise, brake lines aren't going to do much. SS brake lines will just keep your brakes performing better for longer when they are under extreme load (aka autoX).