Hey Ryan,
We paddled the triangle about a month ago. Beautiful area. Had a great trip! We didn't do all that great fishing but did catch enough for fish frys. There are plenty of sites to explore and the portages are simple, except the long one up by Conchu Lake - it isn't complicated, just longer than average. The waterfall on portage 608 is impressive if you want to paddle that far north. We did see more wildlife along the northern area and way fewer people.
Clear Lake was gorgeous with really nice campsites - caught fish there too but not a lot. There were quite a few people in the area but perhaps with school starting soon your trip in early September might be less congested.
I haven't been to Bald Eagle...yet. If you go that route would love to hear about your experience. Enjoy your trip!