Quote Originally Posted by Rahdik
I'll assume you are talking about Mutilate gemming. The OP mentioned ArP capping which led me to believe he was Combat. Combat will gem AP + Hit. If you are thinking we are talking about Mutilate gemming that is where your confusion is. Mutilate will gem AP + Haste.

If your Combat spreadsheet is telling you to gem AP + haste, you just have a strange combination of gear. I never got the Combat sheet to suggest AP + Haste gemming over AP + Hit.
I don't know about that. My spreadsheet tells me to gem AP and Haste as combat. With the Haste trinket, it tells me to gem AP/Hit in yellow/orange sockets.