When you are wrong sell calls.
Selling calls will not adequately protect OP's existing short puts in the face of rapidly deteriorating underlying breaking through the strike of the short puts. OP's looking for ways to protect against short puts. The earned premiums from the short calls is fixed and will not increase to offset the increasing losses due to the continuing deterioration of the underlying value. The OP needs something that will increase in value when the losses on the short puts are also increasing.
To hedge against short puts, OP needs to long puts.