I stayed a bit longer, but didn't find much else at the Bluff. I rounded out my night with some 8×42 binocular observations from Gamehaven around 4:45 a.m: M8, M20, M21, M22, M28, M24, M7 and perhaps others (M18,M23,M25). I also made unsuccessful attempts at M54, M70, and M69 which were well clear of the horizon but low enough to be obscured by atmosphere and sky glow.
Just now I went looking for a few more Messiers in Cygnus and Sagitta from my backyard, only to find them washed out in the light of day.