I have found it tends to drop less if you do not try to keep it to the max setting all the time. Dont know why but it works for me. Seems like once it drops slightly it stays at that level longer. Mine is a 2014 no parts were ever changed except the antifreeze.
The "car care nut" says do not replace the belt unless it is cracked or fraying regardless of age. Definitely do not replace it with a non oem belt. I am at 83k miles on my 11 year old 2014 and the original belt looks like brand new.