Additional LORs for WL?

[PitchO20]

Currently I'm waitlisted at American, Villanova, and Penn St. I'm planning to send in an additional LOR to each of these schools. I've heard back from most of the schools I've applied to this cycle, but am still waiting to hear from 4. Do you think I should send these additional LORs through LSAC or directly to the admissions board?

Thanks and sorry in advance if this has been answered, I tried the search function but could not find anything.

[newyorklaw23]

+1, I'm in a similar WL situation at a few schools.