Thanks for all your responses, they've been very helpful.
On Monday I did 1 cap (25 mg) of 2C-E. Unfortunately, I was an idiot and labeled only the -T-2 and -P bags when I received them (I wasn't sober), so this could either have been -E or -I. Based on my experience, my friend who definitely took -I (27mg, oral), and comparing it to my previous experience with -I (20mg, oral), I would say I did -E. This was a pleasant dosage, definitely quite full on, especially considering what I was doing (biking many miles around the city on a winter afternoon/evening). I'll probably write a trip report later.
My friend just took 1 capsule of -T-2. He snorted ~7mg and ate the rest, with a light meal a little before. He's feeling a bit nauseous, we're about to smoke weed, but he's not overwhelmed or anything (yet). I'll post back as I experience the rest of these compounds.
PS: I know scales aren't perfectly accurate. I believe this scale is accurate to +/- 1mg, so 25 is really 24-26, etc. The -P was originally sold at 15mg/cap (fucking stupid!), so people reported back it was too strong, and the dosage was reduced to 12 (+/- 1) mg. I've snorted 10mg before and found it pleasant, strong but not overwhelming. Just my particular response, of course... I've no doubt 12mg of -P can induce a psychedelic crisis in some.