spaceman, in my two first trips (that were both very strong, with the 2nd being the most powerful that i've ever had with SD), i felt some marvelous after-effects.
then, i don't know why (perhaps the setting) i began feeling more and more stressed after tripping. 2 or 3 trips after this, the after-effects were so strong that made me question if the SD trip was worth it. i tried changing the setting (once i had a trip lying on a big, big wheat-field, it was very nice), smoking more, smoking less, i ordered from different smartshops (normal leaves, 5x and 10x extracts - i had the best results with normal leaves), and then i tried smoking some hashish after the trip (in that hiatus that comes between the SD trip and the after-effects), with great results. it enhanced all the positive sides of the come-down - the relaxed, dreamy-state, with some very positive thoughts and a very fast understanding of what the Lady S taught me.
just for the record, i've tried this method with different psychedelics (LSD and mushrooms), and i never felt this very fast understanding of what I saw. my last heavy LSD trip was more than 6 months ago, and I still don't understand the most of it, and i have to meditate a lot (to lose my ego), to lose my fear and dig, dig, dig in that amazing amount of information that is inside me and i cannot access very easily.
the "trick" with SD, IMHO, is to let go our ego before smoking...never try to judge, question or rationalize what you see. just take it and trust the herb.