X can add to the trip. I would recomend reducing the mushrooms intake BY ALOT. I pill and 1/2-3/4 of a gram of mush would be sufficient for a first time mix. You can always take more later. Be prepared for far more intense visuals and body sensations.
Smoking a joint of Passionflower makes the effect stronger as well as eating pure chocolat or hunny with cacao. Smoking pot alway throws me into a deep trip. I don't like mixing with alcohol. It just doesn't make the trip feel peacefull.