I just gave her a Rank 5 Republic Memorabilia and the ungrateful bratt only said "that's quite nice" +60 affection
While I can get +90 affection with a Cultiral Artifact Rank 1 with Khem Val
My understanding was that you have to build in stages. starting at grade 1 and working high. otherwise you get less... atleast that was my understanding, once their loyalty goes over 2000, you move up, then 4000 same again.