Code:
Blast6Enabled = Yes
Blast6Delay = 1180
Blast6ScorchDelay = 500
Blast6InnerRadius = 60.0
Blast6OuterRadius = 210.0
Blast6MaxDamage = 3500.0
Blast6MinDamage = 300.0
Blast6ToppleSpeed = 0.35
Blast6PushForce = 4.0
Blast 6 does all the work, I don't know what the others are there for. The damage is applied in two radiuses, like normal weapons. Blast6MaxDamage sets the amount of damage that is done to anything within the inner radius, and Blast6InnerRadius says how big that radius is. Similarly, Blast6MinDamage sets the damage to anything that is outside Blast6InnerRadius but still within Blast6OuterRadius.
If that doesn't help then you must be doing something else wrong. I assume you got the reload time to work?