All future training with the EC should be at the minimum stimulation level for that particular dog. Just about everything that a dog can be trained to do can be made easier with an EC. The basic procedure for any training exercise using an EC goes like this. Give the command, immediately apply the stimulus, the dog obeys or you force compliance, immediately remove stimulus.
Once you are sure the dog knows what you have taught it, and it balks at compliance, then you can administer a correction stimulus. Only use a correction stimulus when the dog has demonstrated a complete understanding of the task, but refuses to comply with a given command. This situation can occur for a varity of reasons. One common reason is the dog has a certain number of times it will do a task, but pass that number and it says; no way I’m not doing sit anymore. Corrective stimulus is your counter; yes you will sit one more time. Corrections should be strong enough to get the dogs attention but not so strong as to make the dog cry in distress.
My personal exception to the above rule is dangerous situations. If the dog is chasing deer or some other animal or heading towards a road I will use a very strong stimulus to break his concentration.
The EC should be on the dog every time they go out to the field, do water exercises, retrieving , anything. Routine use of the EC will prevent the dog from becoming collar wise. Inconsistent use of the EC can cause a smart dog to get collar wise. Collar wise being defined as a dog who complies when the collar is on, but not when the EC is off.
If you are going to do hunt tests ( where the dog can not have a EC), then train with the EC to speed up the process. Once the dog becomes so conditioned to routinely obeying your command stop using the stimulus but keep the collar on. The EC becomes like a fire extinguisher at that point. It’s there in case of emergencies.