Use a validated preparation and inoculation procedure for your substrate. Keep treatment, cooling and spawning records separate enough to trace a failed batch. When comparing colonisation, observe bags of the same age and material batch. A white patch at one edge does not establish that the whole substrate is ready for casing.
Before opening the bags, check development and arrange the clean work area, casing material and labels. Record abnormalities before disturbing the crop. Do not use an arbitrary number of days as the sole release rule; strain, substrate and actual conditions influence development. Escalate stalled or abnormal bags rather than casing over a problem to keep to the schedule.