It sounds like you cannot adjust your hsc on the fly. Hsc is generally there to sort out the big landings or the harsh square edge hits you might get. It helps to manage the high speed stuff I.e. how quickly your fork needs to move to cope with what it has just been ridden into or dropped onto and to help keep things nice and comfy for you and to not bottom out too harshly or indeed too often.
Your lsc will help with brake dive and bobbing at the front end for example when you are standing up and pedalling up a steep climb. It will also help with cornering or indeed not if adjusted poorly to suit you.
Find a piece if trail that you are familiar with that has some decent corners and braking zones and set the fork to the middle setting. If you get to much dive under braking you want more lsc. If you feel the fork does not give you enough support you can reduce the rebound compression and increase the lsc.
Make notes of the changes you make and only make small changes. But before you do any of this set the sag correctly!
Of course you could just go and ride the shit out of your bike and not worry about any of the above.