Ashford 30

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Stop using the cat bypass and you will be fine. They clog too easily.
??? The stove definitely should not be run through the full cycle with the bypass open. If the cat is plugging, something is wrong.
 
Like others I would recommend double wall interior pipe, 2 45s instead of a 90, and backing that stove up to minimum clearance plus an inch from the back wall. Since you used concrete board, you measure from the first combustible thing inside that wall behind the concrete board so that would reduce your horizontal as much as possible.

You have triple wall outside and that is air cooled and "cold" pipe so your system will lose extra heat/draft compared to double wall insulated class A.

Do you have a screen at the chimney cap? Those things can clog up fast and suddenly and are a regular maintenance item. This is about the time of year that people start plugging them up.
 
One possibility is you need to figure out where your normal "low set point" is. Sounds as if you may have turned it down to far on the way out the door to maintain an active burn. Normal error until the new operator figures out this set point.

You will eventually use only a relatively small portion of the entire available dial range to effectively control/run the stove. The rest of the available dial range is unused.

A partially plugged cap screen can give a similar result. Some cap screens plug quickly.

A few things to contemplate if you have not already! Good luck.
Is this true and uniform regardless of home size and set up, or tailored to the user?
 
yes check the cap as it looks easy enough to do with your flattish roof.
 
Is this true and uniform regardless of home size and set up, or tailored to the user?
Yes, because the thermostat (air) setting dictates the size of the air inlet but actual air flow through the stove depends on draft, home tightness, weather, etc.