How do I smoke this fenta-dope?

I've been using heroin (or what people sell as heroin) for a few years now with a few small breaks over the years. In my area it's basically impossible to find raw #4 Heroin and everything around here is either a tiny bit of Heroin, some fentanyl, and then a bunch of cut. I've been looking for Raw H for months now but the only thing around is just fent thats chopped down n sold as H. I've almost exclusively been a snorter (insufflation... only IV'd a few times). My tolerance is to the point where I'm only getting well and feel normal while I continue to sniff big lines throughout the day.

My question is simple... I believe the bioavailablity is higher when smoked (correct me if I'm wrong please). How exactly do I smoke this? Any time I've tried to smoke the powdered dope I get around here, I cut out a decent sized square of aluminum foil, place the dope near the top of the foil and very minorly tip the foil downwards (dope on top of foil away from me, foil tilted very slightly downward so the bottom half of the foil that is closest to my body is just slightly lower than the top of the foil. I roll up a piece of aluminum foil around a marker and create what essentially looks like a straw but with a bigger mouth piece. I light my lighter and place it about 1-2 inches below where the dope is. Eventually it starts to smoke and I try to catch as much smoke as I can but honestly it's so hot that it burns my throat. I keep doing this until the dope is extremely crusty and the foil is black. I honestly don't feel like I'm getting high from it... which makes me think I"m wasting it. Am I doing something wrong here? I've seen videos of people smoking Oxy 30s where the pill runs down the foil and they chase it, but my powder'd dope basically just melts, and the smoke is ALWAYS SUPER HOT. I'm not holding the flame too close either. Any tips would be appreciated... Or if I'm wasting my time and should just keep insufflating lmk. I really wish I could find a good RAW #4 H dealer in my area, but everyone has realized that the profit margins are stupid high on fent n it sells just as well so why wouldn't they just sell fenta-dope. I also don't know how tf they're getting their fent....(THIS IS NOT ME ASKING FOR A SOURCE SO DONT SEND ME ANY... ITS JUST A FACT THAT BAFFLES ME). I've been on the darkweb for a while and for some reason not a single market has a single vendor who sells fent. There are vendors who sell fent pressed pills. There are some Chinese vendors who sell the "Zene" analogues (which I hear are pretty nasty, non-euphoric, uber strong tolerance fuckers that Ima stay away from).

Any tips on what I'm doing wrong while trying to smoke it would be GREATLY APPRECIATED!