Not sure if this is helpful to the science....
I jumped maybe, 30-50 times, all round the area with no UA. I had never been scanned by a UA before.
I went to Darnielle's Progress and picked up some Meta Alloys. I made another 20 jumps or so, back to bubble, and then back around the area (fuel rat rescue).
I found a UA, got scanned, picked up the UA. Within 5 jumps I was hyperdicted jumping from Aries Dark Region FW-W d1-32 to Aries Dark Region MN-T c3-3.
Having MetaAlloys and UA onboard made no change to alien encounter.
Hypothesis: Those who have never been scanned by UA might not ever get hyperdicted.