I have always been told that in order to insure smooth casting with a brake system you need to have them symetrically adjusted. For example with a 6 pin system, you could have 3 on and 3 off (they should be alternating in and out though) I typically begin with them set 3 on/ 3 off when I get a new reel and start tying to learn its personality. This usually is good enough for me and from then on I adjust the magnets or tension knob on the handle side.