Edaw, I know it's already been said, but I really think you should give plugging a try. I know this is kind of "kiddy shit", but what I do when I know I'm not really getting that full hit; one that will truly satisfy me, I might take 2-3 Diphenhydramine (Benadryl) ~75mg and add them to the solution. As silly as it sounds, your Pavlovian response might interpret the sensation as getting stronger dope. We all know how powerful our bodies and minds are in terms of aborting withdrawal.
I think we've probably all experienced once or twice, the phenomenon of getting basically unsick once you have drugs in hand/everything is all set. I've always felt that sedating antihistamines add something nice to the Opioid experience. I'm talking lower dosages though, generally not exceeding 100mg.