sorry for saying this, but this mechanic is really simple to explain. No need to write words to explain words that didn't explain anything in the first place.

I will now sum up all the million sentences about "targeting with packages" etc in 1 paragraph:
Place your silos in a tight formation. If you feel safe open up all silos to make them ready. Fire the silos in the back first and fall in with the rest. Target in sequence: To make it easier pick the 3 first targets and fire all the silos in the same order. Repeat for the next targets in line. You shouldn't necessarily target the closest ones first, but the targets that will meet the most likely trajectory.
There. Sumd'up. Done deal. This could have been your initial post, DD...
Why drown people in words when you can give it to them straight?
-First you wanna kill me. Now you wanna kiss me?? BLOW!