I don't own an Ashford, but I've been burning two catalytic Jotul Firelight 12's since 2011, and started with an insufficient supply. I've been working towards a 3-year CSS'd plan, but at a burn rate requirement of 8 - 10 cords per year... it's taking me a little while to get there. I currently have 20 cords CSS'd.
Last year, most of the wood I burned probed at 19 - 23% on a freshly spit face in cold weather. That means it's probably more like 22% - 30% MC, correcting for temperature. The stuff measuring 19% in cold weather (probably about 22% if measured at 70F) lit off the cat just beautifully, after 8 - 10 minutes on bypass after a fresh load. The wood that measured 23% in cold weather (probably approaching 30% MC) was a very noticeable problem, but would still light off the cat after perhaps 20 - 25 minutes in bypass. Clearly not ideal, but these are the things you must deal with when starting of in a new house with a fresh wood supply.
I think that if your wood is really 18 - 23% (correcting your MM readings for species and temperature), you're probably going to be in okay shape. The numbers most folks call out here is just what their MM reads, and typically quote success at any reading close to 20%, but these readings are often erroneously done in cold weather without correction. Temperature has a very dramatic effect on the validity of the readings:
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