I'm probably the gal you are looking for.
First off, being back on dope 4 weeks isn't going to matter induction-wise...sorry. Unless you were off less than 3 days..it's gonna suck. I've had equally as bad of re-inductions after 6 days off as I have with a month off. So, go ahead and get that out of your head. Going from shooting to snorting might have made it easier. I always recommend tapering.
Unfortunately, I don't know the potency of the 10 bags of heroin you've been doing...but, isn't 10 bags a gram? Sorry, where I live we buy in gram (or points of a gram) amounts. If so, that's about my average dope tolerance, give or take, or was anyways. When I first inducted, I also didn't get much relief. I was sick for almost an entire week...not precipitated wd either. Going from a full agonist to a partial agonist takes your body time to adjust, that's just that. The Bernese method DOES work, but you have to be VERY VERY diciplined about it. I have had times when I was, and reinducted just fine, but most of the time I kept the dope up along with the subs and then you just end up becoming dependent on both...which is EXPENSIVE. I thought I would be able to pull it off each time, but I always failed n the end...and that's why I'm on methadone now. And it works great for me. Also an option, btw, just don't let the stigma scare you.
If you are going to do bernese I recommend this: Start LOW on your subs...like 1-2mg at most. If you keep it low like this, you can take your sub between 6-12 hours after dope but MAKE SURE you have dope on hand or you will be unhappy you did this. Do dope like you normally would at night. Sleep. Wake up and take 1-2mg subs. Wait. Wait like an hour. If you don't feel anything, no precipitated wd or anything, take 1mg more. At this point, you should start to feel the precipitated wd kicking in...do some dope (snort it, though, keep your tolerance low). Do only enough dope till you feel better...you WON"T GET HIGH (the subs will block that). The key is to have the dope take away the sickness but to have subs in you. If you start feeling wd creep in again later in the day, take another little bit of dope...like I said, just use enough to be ok enough to function. The next day, take 2-4mg subs. Do some dope (but do less than the day before). The next day take 8mg..use less dope than the day before that. NExy day go up to 16mg. At this point, the subs should be fully in your system and blocking dope anyways, but if you don't feel ok...use a little more dope. After this, you should be inducted and shouldn't need anymore dope to feel ok. Basically, the idea is to slowly decrease your subs and then to slowly increase your dope...and, like a taper, the longer you take to do this..the easier the transition in the end. The problem I've found with this method is that it's hard to put down the dope...your body will convince you that you still aren't well enough to ditch it yet and you'll find yourself still using. If you think you can push past this voice, I'd recommend this method. I have shitty self control.
Let me know if you have any more questions regarding this...I used the bernese method like once a freaking month till i just got tired of that life..methadone has turned everything around for me

Good luck