The allotment is in the Improve category and the active AUMs have declined slightly from the amount authorized when the EA was published. Refer to Table 6.
Forage availability works out to a paltry 9.3 AUMs per year per thousand acres, enough to support 0.8 wild horses per thousand acres.
The HMA intersects 27.6% of the allotment according to Table 5, so the forage assigned to livestock inside the HMA should be around 1,135 AUMs per year, assuming the resource is evenly distributed across the parcel.
If it was shifted back to the horses, the AML could be increased by 94, for a total of 408.
Unfortunately, the current population exceeds that value.