8120 Top Sieve Angle

I see there are higher bolt holes that you could use to hold the top sieve in at a steeper angle. Does anyone do this? What are the advantages and disadvantages of running it in this position. I assume it moves the chaff out the back slower but does it make it easier to overload the bottom sieve. Is it just a case of removing the two bolts and lifting the rear of the sieve or is there other things to do as well. Thanks