I have no evidence to offer, quite frankly. I'm just offering some possible reasonings - I don't have the resources to go find any evidence, although I will be taking auditing courses in the next semester and some.
To put what I've so far been able to read from here and elsewhere, the programs were not experiments themselves but for the most part fleshed out ideas of the developments made in the 30s-60s. Other experiments were being conducted, but I don't think they played a material role in the development of the Synanon-styled programs. It has been more mimickry than trying anything remarkably new since the end of the 60s.
The only other cases where the development of aversives was being tried do not resemble Synanon, but rather relied on hardware, as far as I have seen.