I'd also like a teeny hint that Wyll's looking for someone. Even when you encounter a sulfur smelling mindflayer pod, he won't make any indication that it is notable if you haven't learned about Mizora from him yet. But if you do know about her, he will mention that he thinks it was her pod. There should be a persuasion check at least to ask him earlier when you catch him both times talking to Mizora. The other companions also have persuasion checks in regards to revealing their secrets.
I'm actually playing a run with a party of Lae'zel, Wyll, and Astarion and trying to raise all three's approval high enough to unlock their scenes and have them as options at the party. The
only guide I've found for Wylls romance seemed to have him in the party for any scene involving Goblins. Although the poster seemed to discourage Wyll from cruelty, whereas the character I'm rolling seeks to encourage that from Wyll. Dunno if making him torture Spike will lock me out of the romance, I feel like it won't, but I'll see as I go along.