TEMPORARY SOLUTION TO PROBLEM FOLLOWS:
I let my character refill his stamina Time Average: 3 min 40 sec
Stamina dump from walking took Time Average: 1.8 sec
Stamina dump from running took Time Average: 1.52 sec
Stamina dump from sneaking took Time Average: 4.2 sec
The sneak dump sometimes only dropped to ~50% but still took 4.2 sec
Observation: The dump seems to correlate to the action speed following it.
Experiment: I tried waiting 3 min 40 sec, then sit, and stand back up immediately.
THIS WORKS, NO STAMINA DUMP (tested 3x)
Conclusion: After standing for long periods, sit then stand and go. -Fred