Looks pretty good.
On my WSM I do not worry if the water pan runs dry before the end of the smoke. It's there to help keep temperature from getting too high and by that time the charcoal is burning down and things are pretty settled. In fact, I use the amount of water left as a measure of how well I control temperature. Too hot and it boils off. Good control and there is still some left. I'm not familiar enough with the ECB to know if the same rationale applies.