Thinning the walls help salvage severe founders?

I have not tried this but it appears to be a piece of research stimulated by a practice found helpful. It is a long way to before this can be recommended but it makes sense of sorts. Increasing the flex of the wall may make tearing of the laminae fibers less likely during weight bearing. The give means there is more time for tissue adaption to stress and may increase the amount of support from the ground. I don’t know a rapidly rotating horse nothing is working for may be worth a shot.
DrO

Vet J. 2019 Aug;250:63-70. doi: 10.1016/j.tvjl.2019.07.002. Epub 2019 Jul 4.
The influence of trimming of the hoof wall on the damage of laminar tissue after loading: An in vitro study.
Moeller S1, Patan-Zugaj B2, Däullary T3, Tichy A4, Licka TF5.

Author information:
1. University Clinic for Horses, Department of Companion Animals and Horses, University of Veterinary Medicine, Veterinärplatz 1, 1210 Vienna, Austria. Electronic address: moeller.sve@gmail.com.
2. Department for Pathobiology, University of Veterinary Medicine, Veterinärplatz 1, 1210 Vienna, Austria.
3. Institute of Tissue Engineering and Regenerative Medicine, University Clinic Würzburg, Röntgenring 11, 97082 Würzburg, Germany.
4. Department of Biomedical Sciences, University of Veterinary Medicine, Veterinärplatz 1, 1210 Vienna, Austria.
5. University Clinic for Horses, Department of Companion Animals and Horses, University of Veterinary Medicine, Veterinärplatz 1, 1210 Vienna, Austria; Royal (Dick) School of Veterinary Studies, University of Edinburgh, Easter Bush Campus, Midlothian EH25 9RG, Scotland, UK.

Abstract
Laminitis is associated with failure of the suspensory apparatus of the distal phalanx (SADP) connecting the distal phalanx to the hoof wall. The specific aim of this study was to examine in vitro whether thinning of the hoof wall leading to increased deformability influences the damage of the laminar tissue created by loading of the hoof. Paired cadaver forelimbs from twelve horses were used. For each pair, the hoof wall from one hoof was thinned by 25%; this was ascertained by radiography. The contralateral hooves were used as controls. In a material testing machine, hooves were loaded in a proximodistal direction at 0.5mm/s until a cut-off value of 8kN or 14mm was reached. Afterwards, samples of the SADP were taken for histology. Image-based evaluation of the destruction of the SADP was performed using quantitative histogram analysis. Additionally, three examiners masked to treatment (trimmed/untrimmed) qualitatively evaluated SADP destruction. During hoof loading with forces from 0.5 to 1.8 times the body mass of the donor horses, hooves with thinned hoof wall underwent significantly more deformation (P<0.05). Quantitative histogram analysis detected a shift to higher brightness values and a higher pixel intensity in control hooves, representing disruption in the histologic analysis. Qualitative evaluation of histology sections showed significantly more disruption of the SADP in untrimmed hooves (P=0.03). These results confirm the hypothesis that reduced hoof wall thickness can decrease disruption of laminar tissue in vitro, thus supporting the evaluation of hoof wall reduction as a prophylactic measure in horses at imminent risk of SADP failure.