I would ascend via the “Express” trail directly to Santanoni Peak, then descend all the way to Couchsachraga, and hit Panther Peak on the way out via Bradley Pond. Looping this way makes the total hike about 15 miles with 5,000 vertical feet of climbing.
I encountered my first other humans at the summit of crowded Porter Mountain. I stopped for a brief photo and quickly headed back the Range Trail towards Blueberry Mountain. On the way, there was a perfect rock outcropping offering views of Porter and Cascade, after which I continued towards Blueberry.