You may OC "Utah Unloaded" from 18 to 21 as you are not legally able to apply for a permit.
You might want to consider a Maine permit, which you can get at 18 and has reciprocity with Utah. Otherwise, just keep it in the open, away from school zones and Utah Unloaded.
If you have more Qs, or need more clarification, please ask.
P.S. The map must be wrong. It could be based on BCI information which is incomplete and somewhat misleading.