BRAVO Capt'n! Sounds like you're doing great. Awesome to hear that :D
OP - although it's not meant to be a long term fix to your problem, I think it might be a useful stepping stool to getting away from that needle fixation.
First, whenever you take your buprenorphine sublingually, wash your mouth out vigorously with an ethanol containing mouthwash (I used normal old Listerine). Directly after spitting the mouthwash out slap that puppy under your tongue. Not only will it dissolve instantly and you won't taste it, but also thanks to the mouthwash (well really the ethanol in the mouthwash) you'll increase the sublingual BA as the capillaries (or whatever they're called) in your sublingual tissue will "open up" (or whatever), allowing the Suboxone to be absorbed more efficiently.
The Second part to this is to take about 600mg of Tagamet/Cimetidine 30-45 minutes prior to your dosing the Suboxone. The Cimetidine will significantly potentiate your buprenorphine to the point that you'll get more of a buzz than IV use (imho). The only issue is that the Cimetidine has a number of side effects with long term use, namely the growth of "man-boobs." However if you keep a healthy diet or exercise and don't take it longer than six months or less, you'll almost certainly not experience this. It takes a lot of Cimetidine daily (like >1g multiple times per day) and/or long term use (years) before this even become an issue for the vast majority of people I've ever heard of who have done this.
But yea, I bet if you tried the 600mg Cimetidine 30-45 minutes before your dose, washing your mouth out with Listerine for a minute directly before your dose (do not wash your mouth out with water or drink anything before you put in the suboxone, this defeat the purpose, so put it in RIGHT after you spit out the Listerine), I think you'll be pleasantly surprised. Might be a good tool for you to use to get away from the needle with, providing you with that much needed satisfaction.
Either that, or, like me, get on methadone. I have found a low dose of 'done so much more useful than any bupe. As far as I'm concerned, I'll take a full agonist over a mixed agonist/antagonist ANY day...
Good luck OP!