Guys - you are all me about 4 years ago. My son is a 2016 RHP. I know what you are trying to do, believe me. If you don't have a PG Scout level subscription, well HSBW is here to help. That is the beauty of this free forum. Go to the upper left, in the search button and use it like you do Google. Search "Velocity Progression" and everything else. You will find all you need. It will take some time, but you'll become immersed in it. Look for posts by "Bum" (I am still bummed...no pun intended) that he left the site. I learned more from reading threads he was a part of than anyone.
I don't pay anything on PG, but on my kids profile there is a blue bar below his FB and it says what percentage he is compared to other 2020's....that bar dropped a bit with all those 2020's hitting 80's and 90! LOL
But it's free, you just have to know one kid in the class you are looking for. PM clueless if I didn't make sense and I'll walk you through my kids profile.