Drilling additional small (1/2") holes above the level of the 4 inch holes accomplishes nothing.
Drilling additional small (1/2") holes below the level of the 4 inch holes will allow desaturation of the soil below the level of the drain pipes but only for a few feet radius around the pit. This is optional. A slight hazard exists that mud may enter the pit through these additional holes.
Tornado victims: Do not rush to rebuild. Take your time and look for and get a good contractor. Or consider selling the property and moving to a home that is ready to live in.