You grades are amazing, congratulations! Your baseball measurables are also very strong.
Before you consider a PG year, are you sure you're no longer being considered as a 2019? As the bright kid you are, I would first take a leap and call these Ivy coaches and see if you can get some insight, a campus visit, etc.
Sorry I didn't address your question, I just wouldn't assume the 2019 door is closed until you exhaust all options.
BTW, the PG I know we're neither good enough academically nor athletically, so they bought themselves another year. I know you pass one test, it's the latter you need some confirmation with.