well, smoking during a trip....you wont feel any of the effects of smoking. The acid overwhelms it. And I've never noticed it to intensify/lessen the onset. In my experience it does jack shit.
Either you had shitty weed, or REALLY amazing acid...I've personally experienced differences when smoking while tripping, and so have several of my buddies....and other people on this board. When my buddy tripped for the first time, I didn't talk to him until after his peak, and when I talked to him he said he had just sparked a bowl and that it had brought back the trip to some extent. I haven't been smoking like I did last year when I tripped a few times, but I have noticed that for up to a few weeks after the trip smoking will bring back certain visual effects, usually just a general shifting motion, though last year around new years I had some strong sativa and I got some patterning along with the shifty motion stuff. I've also never felt at all sick when tripping, in fact one time I tried to do the fasting thing before trippin, but as soon as it started I wanted to eat, and ate a bunch during the trip. I've also only had one comedown that was bad, and that's because the peak went sour near the end, so I guess I don't understand how anyone could call the comedown "uneasy." In fact that's one of the parts that I really like, especially around people - I usually get tongue-fucked and can't form a thought, so coming down I love to talk and make conversation and make funnies because I can finally form coherent thoughts enough to be spoken. From a solo expedition, the come down provides clarity, the first chance to integrate what you've been thinking about and the things that you analyzed.