You're wasting your time.
There are "too" many variables involved in mast production for 13-13-13 or any other to have much influence. You can put all of it out you want but if a red oak had two much rain during a certain period last spring...it ain't going to have any mast this fall. If a white oak has too much rain during a certain period or we have a frost at the wrong time or other stuff, this spring, it won't have squat this fall.
There are mast trees that are good producers, fair producers and poor producers. We cannot at this time look at an acorn or seedling or sapling and determine the tree's potential mast production. An application of fertilizer won't move any up in class.
There is little to no scientific evidence fertilizing mast trees provides return for effort. Unlike browse, trees's reaction to fertilizer is slow, if at all. Browse, however, is benefited by fertilizer and the result can easily be seen.
You want mast production, you do the following. If the tree "is not" growing in the open with "no competition" around it....you open the canopy up. A mast tree in a closed canopy or understory don't need 13-13-13, it needs sun.
All mast trees respond to opening their crowns. Mast production is controlled by the size of the crown. Pretty simple, eh?
If you have permission of the lanowner or own a piece of property, and you have mast producing persimmon....get their heads in the sun.
One of my hunting properties belongs to the wife's cousin and I clear cut it 15 years ago, leaving a mature [100 year plus old white oak, hickory and beech] SMZ and all mast producering persiommons I could locate. The persimmons were flagged to prevent their accidentaly harvesting. All these trees have had their head in the sun since and the landowner bush hogs regularly and keeps the competition from them. They are great stands.
Best mast producing oaks on the property are two crown heavy dudes that were valueless as fiber and left in the clear cut area [on purpose].
They are still above the canopy and produce huge amounts of mast most every year.
But, like cover scent, if fertilizing makes you happy, have at it.