Probably. They didn't show that Symbol of Avarice and Golden Serpent Ring stacked in DaS 1, even when they did. So it could be that this doesn't show an increase in Item Discovery even though it does increase it.
Do it. The more people that test it, the more we can determine whether it's absolutely conclusive, or dumb luck. With 157-207 Item Discovery I was getting it every 10-15 min, I think Mulac had 407 item discovery and it took an average of about 6 minutes and 20 seconds. If it does prove to help, this is an amazing discovery
. Makes up for my failed theory regarding password invasions lol.