Toe in stress
Here is what it is like, this is a front view. You can see why this method is more prone to slippage, because if any slight slippage occurs (which can be unavoidable at very high weight), the hanger will eventually slip further. With toe out, if some slippage occurs, the tissues will bunch up because the top is tighter than the bottom. This can be very comfortable, it feels like the hanger is ‘anchored’ on. (again, this picture shows quite extreme toe in)
In general, it is OK to keep the same settings on your hanger for as long as it is comfortable. I do not change the settings between sessions unless there is a problem. Sometimes I might keep the same settings for a few weeks, sometimes it seems like I need to change something everyday. If you change wrapping material, or use a different type, you might need to change the settings to compensate. Also, after a while of using the same wrap it will begin to get thinner because of the constant pressure. In this case, you can either carry on using the same wrap, where you will probably need to make the hex gaps smaller (but move both by the same amount), or get new wrap, where you may or may not need to change the settings. I recommend using the same wrap unless you get soreness in the shaft from the pressure of the hanger.
It all sounds very confusing, but after a while of practice you will know what to do automatically.