I know this post is an older one but how do you feel the alcohol help boost the experience? I agree that it can often smooth out the comeup, but I never found it help the trip beyond that the one and only time I drank some for the comeup.
it was nice to soothe some of the comeup anxiety, and level out the start of the trip a little. i always find the energy that is created during the start of the trip is generally what will affect you for the rest of your trip. the comeup is the most vulnerable time. but other than that it doesn't have much use unless you wanted to get wasted on a small dose. which could be fun, but less about expanding your mind and more about feeling good. esp. with this dose, which was two strong hits, and myself being fairly inexperienced with lsd (less than 10 times) at the time of this trip, the few beers before and during the comeup were very productive to helping me have a good trip. but nowadays, i can calm down during the comeup, like i had a few beers, without even needing to drink anything.