Tbh when I first made offerings to Set, I felt the legit same way. I wasn’t sure wht to offer him and when I finally settled on something (hot cheetos and some coke from word of mouth) it didn’t feel like he wanted it at the altar.
He still accepted me, of course. I think Set, tbh, just likes talking. He isn’t big on offerings (though I am sure he appreciates the effort), at least, that is the vibe I have gotten from him so far.
I’d try just talking to him without them and see what happens 🙂 best of luck