Starting from the somewhat strange RM1 spectra I saw earlier today (alog ), I have been looking at HAM1-related things. I don't think this is a strong correlation, and maybe this just means that the HAM1 FF is doing what it should be, but it seems that the TTL4Cs on HAM1 are qualitatively different between times of good range and poor range. However, the confusing thing is that the L4Cs seem bad at times when the range is good, which means that I don't really understand how they could be causing our troubles. Also, other times seem to not have this inverse pseudo-correlation. So, I'm not so sure that this is a sign of our troubles, or just something totally unrelated.
If one or more of the L4Cs is failing (which can be intermittent), that would change the effectiveness of the HAM1 TT asc ff. Turning off the HAM1 asc FF (as Elenna and I commented on earlier) would help narrow things down. I can try to do an assessment of the health of the L4Cs offline.