The party member propositions have been different since I played a couple times. The first time was close to initial release and Astarion says "oh no not with you, I have standards!" or something similar lol. But I reloaded and when it's his idea, he goes for it. That play, I made EVERYONE mad all the time and Gale was Medium? But yet everyone propositioned BUT GALE.

2nd time was after patch 6, and I had made the flirty talk with Astarion and had the extra scenes before the party. Felt like it was a natural romance progression...but I was attempting for Gale and he was not picking up what I was laying down lol. When it came to party time, only Astarion was interested and iirc one of the people suggested he was wanting to buddy up. Made sure to talk with him last to be sure. Again, this felt like I had already made a choice and that it wasn't anyone and everyone wanting to get some action with Tav.

Gale has never proposed anything at camp because I think I haven't had him go through the death scenario. My druid was too good at keeping him alive. That, or something else overrode the scene needed and I have no clue what. I intentionally slept a few times at the campsite with everyone (not the dungeon camps that have a few peeps missing) before turning in the druid. Nothing. Gave up and went for the vamp who expressed interest...