Amounts needed for plugging seem all over the board. Not sure if you're on any other 5meo groups, but some other larger groups have more experimenters and as far as I can tell, it seems most (though not all) people need more when plugging than when smoking. Also, most people get longer experiences from it, but mine seem to be about the same length as smoking. Nottwo seems to luckily be on the more sensitive end of the scale.
And although it seems to take ~5 minutes to come on for most people, a few have said it came on within 60-90 seconds and they were NOT prepared and situated yet. (Just wanted to give you a heads-up.)
This ROA just seems really variable from person-to-person...so start out extremely low and see if you feel anything. If nothing, double/triple your dose and try again :-)
As far as my smoking requirements, I guess I can't be sure if my FB has lost any potency over time or not, so that's a possibility. Also, I find it pretty difficult to get an *ACCURATE* measurement with my $20 mg scale. It's +/- 3mg accuracy, which is pretty big when using such a small amount. So I weigh my dose several times to try to get a correct reading, but I don't have a jewelers scale like some on here do. But assuming my FB is potent and my scale is accurate, when I've tried the 10-13mg level, I've always needed more to release.
Hopefully you're on the more sensitive side and can conserve your stash :-)
Let us know how it goes for you!