MGS,
I've experimented orally from 40mg-75mg before I switched to the rectal route with this one. I started at around 40mg and kept going up with it to 75mg until I went rectal. It's hard to make equivalency determinations since a trip is so subjective and personal, and also the variability you mention with the 2c's from person to person. But I can say with complete confidence that 30-32mg rectally blows away 75mg orally. There is no comparison between the two. This compound keeps getting more complex and deep as you go higher. And is still feels very safe to me.
Each time I go higher with it, it surprises me more and more. Nothing bad or negative. And the trip is so brief, that the intensity doesn't hang around too long. Basically I get a rapid comeup, enough time to do a bit of pshychdelic head work (which I need badly yesterday) and then I start to come down quickly. I got through a box of whippets yesterday, but I didn't even take the time to smoke a bowl until after I came down.
I made quite a few personal decisions yesterday that I have been uncertain about (changing jobs, etc) and it also made me decide to seek medical help for hearing loss I am suffering from. I'm pretty much deaf in my one ear and yesterday really made it sink in that it was time to see a doctor. I will be visiting with family for the holidays again soon and it also put me in a very positive frame of mind for the trip.
MGS, you mention about not finding time to trip since August even though you two keep saying you are going to do it. These days, I suffer from a phenomenon where I can sit all day and make excuses not to trip, even if I have the time. It's really weird. Like subconsciously I'm trying to talk myself out of it. But then once I do it, everything is fine.

So anymore, as long as I have the time, once I've made a decision to do it, I will not second guess myself. I basically just do it immediately or I will sit there and talk myself out of it. I've yet to have a trip I regret, even under these circumstances. I'm not sure what's going on with that, but it's a rather recent occurance (past few months) for me.
I'm again at the tail end of a (this time mild) opie WD since I relapsed and started using again. I only had a short run this time though, so the taper has not been bad (yet). I was tempted to use yesterday, and the trip made me realize how important it was NOT to break my taper and use a recreational dose.
Yesterday's excursion at 32.2mg up the bum was simply beautiful and incredible. The dose/response curve is getting real steep for me at this level though so I will increase slowly from here. It will likely be several weeks before I try anything again, and not sure if it will be 2cd when I do, but my next time will be at 34-35mg. I'm very excited to see what it will do at this level. I do feel I'm at the 'every few mgs counts' level now. Sadly, I'm also pretty much out of this compound, so I think there's only a few opportunities left to see where it will take me.
If you feel you got full effects personally from an oral dose of 40mg, perhaps you should go around 15-20mg rectally? I would guess (we're all different) this would equate somwhat around 40-60mg orally? With your expereinece, I'm sure you will handle it just fine and if it does get a little strong for your liking, the peak is over quickly.
Take care and please update here or with a trip report when you do get around to trying it. I'm interested in hearing what others think of it using this route.
-gp