The damage reports are reminding me a lot of Hurricane Maria. The steep terrain in a lot of these areas enhanced the wind and flooding damage, and is also obstructing relief efforts.
Agreed the dry air source to the east has been effectively cut off by the band from the south wrapping up the east side of the storm. Any dry air left in the core is being mixed out by the minute.
Just my opinion but it looks like the dry air is on its last stand and the banding structure is looks robust and locked in place. Usually this indicates the start of a 12=24hr RI period.
Radar bands filling in the SE quad of the storm. There are a couple of hints of overshooting tops forming on IR. Maybe a connective burst going off there in the next few hours.
From what I can tell the GFS Euro Gefs and EPS all track close to Perry or slightly west. Also that's the eastern edge of the NHC cone, so I'm not going to interrogate anyone who favors that track.