This is a fantastic post as this happened to me as well almost word for word with a different ring I had. Pawn showed it as a 5% upgrade but when I put it on an simmed it was a dps loss over what I had before because I think my haste dropped too low. I find 18%-20% haste seems to be the sweet spot for me. That is with Shoulders and Boots legendary and 885 BTI and 900 Mastery Trinket