It may work somehow in a regular raiding, but in CW, when an attacker has plenty of time to plan the raid, no TH9 stands a chance against hogs, no matter layout and CC content. Giving them lvl 4 giants bombs seems quite fair to me.
Printable View
One big bomb on the top, 2 small bombs laid across each other and one big bomb below the 2 small bombs. That's a combined damage of 490 damage which is RIP for maxed hogs that have 460 hp.
Yes, all bombs are triggered at the same time when the hogs run across as they are placed between 2 defenses.