Great - you held a fire overnight
A few hints to try out ... fill up a little more and close the internal damper earlier, when the stove top is ~ 400-500*. I heap it up more toward the back plate and closer to the side vents. I use a little coal shovel to pull the coal up toward the back and away from the top of the grill. The sooner you damp it down, the more heat you'll keep inside the stove and not loose it up the chimney. This will help you have a thicker bed of coal for a longer time and make for a shorter cycle time when you reload with fresh bit. Your morning fire pictures shows a thin bed of coal and ending the cycle time with a thicker bed is a good goal to shoot for.
I don't know if it will help at all since you're burning bit, but there's a secondary air inlet on the left side of the stove. When you damp down wile the volatiles are burning off of a load of bit, opening it a little might help with secondary combustion of the volatiles. At least that's what that opening was supposed to do when the Vigilant design was a wood stove. I don't use it at all but I only burn anthracite.