I have to agree with Branson, don't worry about PG's number or the top prospect list. Here is why:
1) You received contact from colleges following your PG Showcase. You got this attention because coaches were in attendance and actually saw you. That is the value of Perfect Game. They get college coaches to the park because they attract players who want to play at the next level (and who can play - but many show up who cannot).
2) Nobody ever got offered a scholarship, or got drafted, based on a PG score. Not one.
3) PG scores are subjective, it's what that particular person writing your report saw and thought about you. Some are highly qualified and make great reports. Some are longer than others, more detailed.
4) The nature of the PG Showcase is to give you an evaluation that gives you and others an idea of how you stack up against other players who Perfect Game has seen. I've seen kids go to PG events as a position player and not get a single hit and still come out with scores as high as 8, 8.5. Ultimately, just go "ball out" and the chips will fall where they fall. Don't expend too much thought or worry on the number and lists. Get in front of those coaches and work hard. Your measurable look solid for your year group.