I snagged an August 9 Yampa permit, we did it all the way to Split Mt in 5 days. We had a great trip, but even at 650cfs we grounded out a few times, no big deal, we probably got lazy looking for the best line (we were in an IK and packraft, low draft, fwiw).
I mention that because I've become convinced the management of at least Yampa permits is poorly done. On our launch date, permits were booked solid before and after, yet the check-in ranger commented that no one had launched for the 3-4 days before us, and that had apparently been the only launch for that entire week except for us. We had the entire river to ourselves until Echo Park.
So if launches are being shifted to Ladore, fine, but that's pretty predictable in the late season. Certainly for the large boats. Why can't someone free up those permits for folks like the OP? At the current cfs level I'd bet a paycheck that...90% of the Yampa permits never launch? Something seems amiss. Just my opinion.