I have done this many times by now, and I like to experience it in waves.
My self-adjusted timetable of dosing for this is to first ingest one medium-intensity LSD dose. Then I will consume a strong dose of cubensis mushrooms at a certain point between the +1:45 and +2:45 mark.
The way I meter it out is by how I feel. After an hour and forty-five minutes, if I still feel heavy effects of the LSD, I slowly chew up my intended dose of cubensis. By slowly, I mean I take the full hour to consume it. This is a party-only dose schedule, as your trip will last for what seems like eons.
However, if the LSD trip is significantly less than expected (or if I feel I can handle it) I will consume all of my intended dose (usually about 5-7g) right on the 1:45 mark.
Doing it the slow way, you get an LSD peak followed my the slow shift of balance between the LSD's lapping effects and the cubensis's swelling murmur in the back of your head. The cubensis will pretty much ring out the entire time the LSD experience fades out.
If you do consume all of your fungus early, you should already feel pretty good. For the next hour the LSD's oceanlike lapping at your CNS will fade away to a tidal wave of psilocybin, usually ending up in a very "exposed" and open trip. Think about what it feels like to pry open your third eye.
Sort of the whole "looking up at your ceiling in fear, because it's so great" experience.
I've had too many.
--mic