I think what I'm remembering was talking about NPC interdictions, that only NPCs a certain range of ranking around yours would interdict you (but it counted the highest of all your ranks, combat/exploration/trading, so if you were harmless combat but Elite exploration, the interdiction code counted you as Elite for the purpose of working out if an NPC would interdict you or not). It didn't specifically talk about Signal Sources, so we don't know if rank also affects those, but it's reasonable to think it does, given it does affect other encounters.
I think it's worth dividing into to aspects.
- The chance of a signal source being Strong
- The chance of a strong signal source containing a military convoy
- The chance of a military convoy containing a UA
I had wondered about influencing these factors but gave up since thr RNG made it really difficult to determine anything and all I was doing was trying to think what would "make sense" which to be honest in the end I thought would get me nowhere without being able to prove it.
So for example I thought it made sense that being in a low sec system would increase the chance of (1) but conversely decrease the chance of (2).
While being in high sec would decrease (1) but increase (2) meaning arguably they balance and sec is irrelevant. =p
I mean (3) may or may not be totally out of our control, but increaseing (1) & (2) might be what is happening with Mr Tree.
Or maybe not, maybe there is something about CMDR Branch that heavily affects (3).
Mr Tree do you feel you get an inordinate amount of SSSs or Military SSSs? =) For me they seem to come in runs, ages without then you'll get a bunch (3-4).
Just to throw something else in it could be a time element,
i.e at 2am each morning a UA leaves from <x> and jumps around randomly from system to system, occasionally hitting Timocani.
I don't know if the P2P architecture means that's not possible.