I use a bit different set up in my games. Bombers do well at strategic bombing while still keeping other options.
inf 1/2/1 3Pu AA
art 2/2/1 4Pu AA +1 attack bonus to infantry
arm 3/3/2 5Pu AA blitz
fig 2/2/4 5Pu 2 air at 3 air def
bom 2/1/6 6Pu 2 air at, strategic bomber
sub 2/1/2 4Pu
tra 0/0/0 5Pu
des 2/2/2 6Pu
cru 3/3/2 9Pu AA bombard 3
car 1/2/2 12Pu AA
b.s 4/4/2 16Pu AA bombard 4 2HP
trench 0/1/0 3Pu 2HP, repair, only one can be placed per territory per round.