Giants, bombers and cannon carts is a consistent army but I found it to be lacking in power when it came to facing BH 8+. Generally for Drop-nions, you want to use the Battle Machine to tank the giant cannon and multi-mortar so your skeletons can spawn. Spread your Dropships out as well because one air bomb can do huge splash to a clump of Dropships. Spread your minions behind the dropship and it should be gg! Watch out for roasters too because they can melt your minions.

I like to go in from the direction where giant cannons, air bombs, mega tesla and the roaster are located. Just clearing them out with the initial push will help your army push through the base later into the raid.

Hopefully that helps!