Peter, the trials mentioned in #23 are in part reported by the 1999 AIAA paper.
There were preceding tests with a BAe146 (N.B pre FAAM, but same a/c) flown in Panama. During these tests, in addition to measuring water content, engine anti-ice heat-flow, etc, in the vicinity of Cbs, a few Cb penetrations were made at high level (FL300) and one brief one at lower level. The resulting rough ride / damage suffered in these were the main reasons that the subsequent tests did not go into the heaviest echo regions in the US, but also that the particular icing phenomenon being investigated was occurring well away from the storm core, generally in or under the anvil.
I don’t know of any public report of the Panama tests, but a paper given at a European SETP meeting in Manchester discussed the flight testing and instrumentation aspects of the US tests – sorry no ref or link.