Is there anyway to control where personal ordnance drops come down?

Nope.
It'll work the same way on every map. The only problems I've found with it is when it hits at a weird angle and ends up horizontal or in forged maps when it hits somewhere inaccessible. Other than that I believe there is a three dimensional radius of impact possibility, and if possible it will land where the user is looking.

 

Isn't personal ordinance the thing that you yourself control where it goes once you get enough points for one?

 

^He means on the map. Control the drop points. Something you can't do.