If you simmed better with under 30 item level difference in your tier then you do not know how to properly sim. If you would like post your sim and I or others on here can most likely tell you what you are doing wrong. The evidence and information is there to disprove what you said, especially considering the 2 piece is completely irrelevant in the set. Unless you are of course simming a multi add fight, in which the eye beam damage would probably outsim old tier yes. All the more reason to post your sim so you are not flamed
EDIT: just saw ur sim post (missed a full page lul) and you are simming 2 piece with eye beam build I'm assuming in that post, would need the other sim with T20 and CB/neme build aswell or just a SS of your sim page off raidbots.. i'm assuming you simmed eye beam build with old Tier 20 aswell and that is easily why you sim higher, there is no reason for you to be simming higher with 2piece, as it is completely irrelevant for our tier.