I am not certain of the dk1 compatibility with HF, but you mentioned you tried the experience again without drinking and for the same results.
In my experience, sobriety is a tested method to eliminate double vision, but since this did not fix the problem, it might be related to the dk1. Do you have the double vision persist after removing the rift? If so, you may need a doctor.
Ok trolling aside, I sent my dk1 home with one of the devs I work with and I’ll see if he can look into it. I’m hoping that I’m picked for an htc valve headset and can perhaps help integrate that to HF.
Until I hear back from him, good luck!