The best I can tell ya is to TEST, TEST, TEST.
Timing has to do with thickness, outside temp, smoker temp, etc. Keep track of time till find it right. The fish will apear and fell more moist when it is right out of the smoker and warm but will dry some as it cools. Keep an eye on it!!
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Have you ever listened to someone for a while and wondered..."who ties your shoelaces for you?"