Hey man! Don't worry, no lectures here. I've talked to so many people in your same or a similar circumstance with their maintenance medication. Every one of us who have been dependent upon Opioids want to get high from time to time. I don't know if that is something we can ever actually outgrow. All I'm going to say is, I really don't want to see a fellow BL'er dig him or herself a hole that they will later regret and I feel this is the road you're trying to go down.
There was a bit of a typo in your original post, but I'm assuming your intention was to say that you typically take 2mg-3mg Buprenorphine sublingually as a typical venture? Buprenorphine has some complicated pharmacology and pharmacokinetics that make this whole thing more complicated than a simple "use more". Essentially, what we are all after is an agonist of the Mu Opioid Receptor. There are other receptors, but the majority of the positive feelings we desire from the use of Opioids are directly related to agonism of this specific receptor.
Buprenorphine is a more effective Mu agonist at lower dosages. The lower the better really. The positive/desired effects do not increase in a linear fashion the higher the dose goes. When you take dosages of more than just your typical 2mg-3mg, you begin experiencing stronger agonism of the other Opioid receptors i.e. Kappa; Delta, This isn't really what you want. So, with this in mind, I feel that the most practical solution is for you to experiment with an alternative Route of Administration that will provide you with a faster onset and, hopefully, that feeling you're after.
I'm a former injection Heroin user. I am a major proponent of rectal administration of drugs as a safer alternative to injection. It's a route of administration that typically (like with Buprenorphine) provides an increased bioavailability and a faster onset of effect. I really don't support injecting Buprenorphine strips as they have become notorious for the disproportionate amount of complications that they seem to cause. Smoking/vaporizing is not really practical here either in my opinion, but anyone else, feel free to chime in.
It's easy enough. Just obtain an oral syringe. They will give you a free one at the pharmacy if you say something like "I lost my dosing cup for blah, blah". Any oral syringe will do really, but the vatriety with a a pointed tip at the end, I've found, are best. Fill your syringe with water. They are typically 5ml or 10ml but the amount of vehicle here is really not super important. Dissolve your given dosage of Buprenorphine strip in the water. Mix thouroughly. Once you have a fairly uniform solution, it's recommended to lay either on your side or prone. The next part is fairly obvious. The syringe will go partially into your rectum, if it is the type of which I've mentioned here, you will insert only the tip and you will know when it is in. Slowly push the plunger until the solution is administered. Remove the syringe and stay prone for 10-15 minutes.
Here is a helpful link that will help you modify your dosage based upon Buprenorphine's differing bioavailabilities:
The systemic bioavailability of buprenorphine has been studied in female rats following single doses (200 microgram kg-1) administered by one of six different routes. Relative to the 100% bioavailability from the intraarterial route the mean bioavailabilities were intravenous, 98%; intrarectal...
pubmed.ncbi.nlm.nih.gov
If this is a too long, didn't read situation, just know that Buprenorphine is generally absorbed ~10%-15% by the sublingual route and ~50% by the rectal route. I'm sure you can do the math. As the Buprenorphine strips are going to end up in a solution anyway, you can dose volumetrically. This means for instance:
Dissolve 8mg strip in 10ml of water so that each milliliter administered is about 0.8mg and so on. If any of this isn't clear just get back to us and we will help you out.