I have been using the su-7bkl to grind in the russian tree and have been using the fire bombs since at the time 2 bombs would deal 1/2 damage to the base and deal 1/4 of dot damage. Then after a update dont remember which 2 bombs would do half damage to the base and then dot for about 5% of the hp. so instead of 3 bombs to take out a base it became 4 bombs. Wasnt sure what happened so i just used 4 bombs and grinded, but just looking for answers