Sammy here is the update.
Back sweetened the wine from negative .990 to 1.010
Used 42 ounces of inverted sugar.
Ph 3.61
Acid .825%
When you first taste it you taste strawberries then afterwards you taste the watermelon.
It is awesome. I added sorbate earlier so I just added a pinch of sulfite.
I am returning it to my cellar where it is still cool to watch for refermentation over the next few weeks then bottle.
Julie was the first to do this and I had been wanting to make it for 2 years. The 1st year I missed the watermelons at the store and FYI I used fresh and ripe seeded watermelons.