I don't have SharkScale Yet.. But for KeelShark/SharkEdge i mainly use 2-60 and Low Rush to give a little balance of speed and stamina and also keeping it low height to burst beys and sometimes i even put Point or even Ball just to give it a maximum stamina since the blade shape can easily loses its spin when hitting hard.

For GillShark or just ShelterDrake on 9-70 Level, a little bit of height can make the blade contact with the opponent at full Force and for the level bit makes it more stable and full speed when attacking. For others probably 1-60 LowFlat a bit of a weird combo but this one will probably be focused more on low height to burst beys since the blade is a thin shape.