Mini 4 tire recommendation

[Muskie1]

 I have the Cst big boat tires now. I was never real confident with them off pavement. I recently bought a lighter bike for short trips because the Mini is a pain to get out of the house. My Gotrax came with a knobby tire that has been awesome on grass and gravel. Noise doesn't bother me and a little range loss is no big deal.
Does anyone have any advice or recommendations for something more aggressive?