Still trying to unlock the RNG's LOL so much to do and so little time
edit.. i miss read your post... i saqw RNG and thought you were unhappy about the UP spawn rate.
you do not need to unlock palin it can be done without corrosive racks.
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do it in a cheap ship with good jump range, should the worst happen its not a problem. get the UP 1st as it takes longer.... then get your UA from the crashed thargoid ship, this takes a few mins..
if worried fit an auto maintanence unit.
once you have both, get your backside to the base. the 3 locations (thargoid base, thargoid crash site and the popular ammonia world to get the UP from ) are all 3 jumps from each other.
once you are on the ground outside the thargoid base, get the 2 things in your srv.... any damage your srv takes is fixed by boarding and unboarding again.
1) unknown probe - look for threat 2 degraded emissions. 13MM from planet and circle around (apparently 240 - 300 km/s) PLEIADES SECTOR KC-U B3-1 8
2) Thargoid Crash Site (UA source and worth a look anyway) HIP 17862, planet 6 C A Coordinates 30.33 -98.58
3) Thargoid base HIP 14909, planet 2A Coordinates -26, -27
failing all that, i if you get to the system with the base noted above
, i can TRY to get on tonight at around 10pm BST (i cant promise tho) and you can go in with me. you will need to have access to mobius however, i do not want to do in open as i dont want a murderhobo blowing me up and spoiling my plan for going in again in 2.4. PM me if you plan to do this and make sure you are landed outside the base by 10pm BST. it will take maybe 15 mins to activate it again now i know what i am doing.
(not trying to start a modes argument or anything its just i DONT have time to go and get the UP again before 2.4 drops as am off on hols on weds).
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so.... i did it in open... after 40 mins of no joy doing in solo, it occured to me, when you take a mission (kill x pirates) the more CMDRs in your instance i find the more mission targets tend to spawn... so i wondered if it worked the same for USSes. so logged into open and sure enough there were 2 others doing the same as me. a quick hello to a guy in a conda - who was v friendly tho i kept him in front of me just in case

and another guy in an asp.
sure enough within 5 mins, i got the level 2 degraded emissions .. luck? i dunno but there is a logic to why open or a PG with plenty of players may be preferable.