I think I've seen it somewhere in the various updates, but are you using the internal RC or the PLL clock on the tiny85? i.e. 8MHz or 16MHz? I have a project/shield idea that's really kind of nice, but it only firms up at 16MHz. I imagine that the fuses will be a little on the untouchable side of things since it sounds like you've set RSTDISBL to get P5 available as a pin.