Not an adcom, but here's my take.
Incredible, standout personal statements tend to be incredible and standout because of their content, not the quality of the writing as it is conveyed.
Imagine two students. Student A grew up in extreme poverty, cared for siblings between their schooling and their evening shifts at work, etc and they lay this out in very plain language.
Student B lived an average unremarkable middle class life, and spent a lot of time and effort crafting a very well written statement, describing how they had a good shadowing experience and then did some volunteering etc to further explore pre-med.
Guess which one is in the 5% that makes the app reader really want you to get interviewed. It's A, and what makes it an important part of their app is the content of their life they are describing, not how many rounds of editing they did before submitting it. For most, the PS is a box to check. It can't be terrible, like describing something inappropriate or full of errors, but if your narrative is a typical cookie cutter narrative then your goal is just to be normal--you probably won't get into the "memorable in a good way" pile with any amount of revising how the statement flows, so your job is just to avoid the "memorable in a bad way" pile.