To be honest, in regards to the school specific questions whether it is your lower tier school or your 'reach' school, I believe it is very important to eloquently write any essay that fully answers the school's question. Not only does it show that you actually took the time to research/write, but that you are very serious about becoming a PT.
I know it sucks and its going to take a long time writing multiple essays, but I'm sure it will be worth it once you get into one of your schools. To this end, IMO essays do not have to be max 4500 character count, you probably many a time heard of the phrase, 'quality not quantity.' That said, in my case, so far I have typed up the 1 PTCAS essay, and 3 school specific essays, all of which are close to the max (not saying thats a good thing), and I have 2 more to do.
PT application cycles are not an easy task, they are supposed to challenges us applicants.
In addition, make sure to research a school's admission process, some schools don't even look at the PTCAS essay and actually only really read their school specific question. These schools basically force you to write a good essay unfortunately.
Hope this helped !!! you can do it!