Bug?
The Level 7 set description says +3 Artifact to Hit and Damage and +10 to Search and Spot. This has been the set effect for a significant length of time and is comparable to other equipment around that level.
The description in-game and performance says +3 to each and the performance is giving Artifact +3 to Search and Spot, which is comparable to Level 1 Korthos gear set (which is competence bonus). I believe this was a typo using the +3 from to Hit and Damage, but maybe it was intentional.
Thank you for passing this along to the relevant party if this is not the correct location to post!