I’ve noticed that on my main character, which is well above CP810 at this point, with max Legerdemain, will get 4K per chest for a while and then only 1k per chest, lockpick, or safebox thereafter. I have a regular farming run for mats where I hit the chests as I encounter them. She also does all of my thieving activities. I have tried all variables I can think of: difficulty of chest gives same XP, switching between the two sets of gear she wears doesn’t make a difference, switching zones gives same XP as before. I’m not sure what else to try. Can anybody shed some light on what might be happening here?

If 4K is the amount I should get every time, then I could be missing out on a lot of XP from Legerdemain activities.