How to nod on heroin? And not OD.

I've never nodded before, except once. And I keep hearing so much about how good it feels, etc.Almost 6 years daily heroin usage... No nodding. The only time was when I got some fent-laced shit + 1mg xanax, earlier on in my heroin addiction.

(Other addicts are able to nod on the same dope I take. But I'm not... Why is this? It's worthy to keep in mind that I have a big tolerance; 6 years daily without any breaks. Haven't even gone 24h without opiates since I first got addicted.)

Except that one time early on in my opiate-addiction, I have never nodded nor even been close to it...

Can someone give me tips on how to nod when you never get high anymore? It's just the rush, essentially. Then afterglow that gives a calming feeling, mostly in my legs. (which disappears the instant I move)

Or am I essentially doomed to never nod again? My dosages are 0,3g 3-4 times per day. (0,9-1,2g)With my tolerance and 6 years of using without any breaks, is nodding even possible?

If other drugs are required, I have quite a few xanax, rivotril, nitrazepam, alcohol, weed(hashish) and of course; heroin. Would a combo perhaps help towards making me nod?