Before I get started with this, I would urge anyone thinking of combining 2C-T-2 with other substances to research it well and not rely solely on this report.
With that said, SWIM recently found this to be a GLORIOUS combination, with 22mg 2C-T-2 taken at T=0, followed by 30mg 4-HO-DiPT (Iprocin) taken at T=1:30.
SWIM had tripped on 30mg 2C-T-2 two nights before, but it resulted in high body load with only weak mental/visual effects. SWIM thinks this was because he was tripping with someone he was not that comfortable with, resulting in psychosomatic discomfort and mental grounding.
So he decided to try again alone a couple of nights later, to attempt to get where he wanted to go.
SWIM had recently been reading a thread about 4-HO-DiPT, where people were saying that the dosages listed in TiHKAL and Erowid are low and that the magic with this chemical starts at 30mg or so. SWIM had not previously been that impressed with 4-HO-DiPT, so he wanted to do it at a higher level (previously had gone up to 22mg). Thinking that there might be some tolerance with re-dosing on 2C-T-2 after doing it only two nights before, he decided to throw 30mg 4-HO-DiPT into the mix on this occasion.
He wanted the two to hit at about the same time, so he did the 4-HO-DiPT (which usually hits fast) about 1.5hrs after the 2C-T-2 (which can take a couple hours to hit, although it started coming on faster this time).
The result was fantastic! The visuals (OEV) were strong and out of this world beautiful, and he was in a wonderful psychedelic headspace. He was on the verge of ego loss at times, and the 4-HO-DiPT brought on brief insights into the oneness of all things, the likes of which he had not experienced since long ago (on mushrooms).
SWIM really isn't sure how the 2C-T-2 affected the peak of the trip, as it mainly seemed to be driven by the 4-HO-DiPT. He could definitely tell when the short-acting 4-HO-DiPT began to wear off after 3 hours or so, and the trip went down a few notches at that point. So SWIM will have to do some research on 30mg+ doses of 4-HO-DiPT alone to see how they are.
One other thing to mention is that SWIM had taken about 1.5mg alprazolam (Xanax) spread out in 3 doses over the 36 hours prior to this. He was really relaxed going into this trip. (One reason he decided to do the relatively high-dose combo was that he was afraid the residual effects of the alprazolam might deaden the trip somewhat.)
BTW, there was no body load whatsoever experienced on this trip - It felt great! (SWIM does not seem to experience much body load from RC's in general.)