Percussionists! - double sticking

anything but option 1 I think, as it isn't inherently obvious what you want done. With mallet percussion, probably option 3 would be more conventional as I've never seen slash notation in anything other than marching percussion

Is this for marching band or concert percussion? In marching band, that would probably be fine. We played a transcription of the fourth movement of Tchaikovskys Fourth for Percussion Ensemble, and it has something similar to that, but the 16s were notated out.
Just a thought.

I'd personally use example number 3: it just seems much more flowing and easier to read. Seeing 8ths with diddle markings just looks awkward to me.

Yeah, outside of drumline, it probably would be written as sixteenths. In fact, even in drumline, I've never seen anything written like that.
Looking at the xlyophone passage, it seems as if any smart mallet palyer would play those as doubles...

~Kal