With my very heavy arrow setups for both of my light poundage bows, I've been using a 2 blade 130 grain STOS.
But, this year, I'm going to a light arrow setup shooting a 2212 arrow. I'm getting the maximum speed out of both of my bows with a 75 grain point weight, but there are no 2 blade 75 grain broadheads. With that said, I'm going to borrow a page from the compound shooters and I'm going to use a 3 blade, 1" wide Muzzy 75 grain broadhead.
Since it's a 3 blade broadhead and I'm shooting light poundage bows, the more I think about it, I'm going to limit myself to broadside lung shots (my favorite) at 15 yards and under.