Hotreddun,Keep your husband's dremmel away. LOL A lot of farriers will notch the wall with the edge of the rasp above the crack like your husband is thinking, to stop it from traveling upward, but as that grows out, then you have a weaknd area that is going to want to break off bigger than it would have, plus, you are weakening the wall enough to invite more bacteria in, probably not the best idea if you are struggling with that already.
And with a dremmel, it's very easy to take off more than you had planned, same with grinders, etc. and I'm just old-school enough I don't care for the power tools to be brought it. LOL They can heat up, too.I can gripe all day about it, but some farriers really like to use them. One of the vets around here uses a dremmel on cracks if they have WLD and makes a crack wider and smooth without a total hoof resection to make medicating easier, but that's just for special occasions.
Really, I find that a little notch at the bottom, just enough to make a triangle to the crack will take that spreading force off the crack enough to stop it (if it's a dramatic crack, the less severe ones I don't even do that with) and make sure that bevel is up to par, and that is plenty to stop the crack. On my website, if you look up case studies, look under Misty, aged QH mare. She is in her teens and had had a persistent toe crack for over 10 years. And over the winter we had it nearly grown out before I went on leave. All I did was that bevel, slight notch at the bottom, and 4 week interval for the second trim, and 6-8 weeks after that
I was thinking when I read your post that you were keeping yours on a 2 week rotation all the time, and thought to myself "Something is wrong with that trim!" but I understand now. Still after a couple of months you should be weaning back to 3-4 weeks.Even with severe founder, after a couple of months, I drop my trimming intervals back to 4 weeks. I would like to see the radiographs, out of nosyness, because I have seen what wedges can do for a hoof and it's not pretty. But I think would be good for other people to see on here, as well. Educational!