I have 2 cool little bombs that i like testing against bunkers but they don't stay hot after exploding so they can't melt the qrtz and things like that.
Also about the bomb, it's mostly fine, some bunkers are just too tough to penetrate by brute force. You can do a few things like setting the ctype of the BCLN outside and using LIGH instead of Thunder.
And this thread should be in the creations section.