when grouping DBs you can use the manual dive bomb (;) to group them

when grouping TBs i usually launch them and let them form a half circle. then when all of
them are out, i move them toward the side of the circle with no planes

<--------------------x
<------------------------x
<---------------------------x
<------------------------------x
<--------------------------------x
<--------------------------------x
<-----------------------------x
<---------------------------x
<-------------------------x

this will make them move toward that spot and group at the same time