For me, the uncomfortable body load was because of the smoalking device. Maybe this sounds silly, but for me it really isn't. I smoked at first from a lightbulb (which was terrifying in terms of residual effects), then the machine (slightly better, but not perfect), and at last I bought a VG. But this wouldn't work the way I'd try it. Not with multiple filters, not with a bed of herbs. But with a metal mesh.
The body load is completely transformed, feels like a hit of LSD on low doses and waay cleaner than anything else I've tried - no anxiety, nothing but a pleasant, warming, energetic sensation. All I'm suggesting is, consider switching the equipment if everything else failed. And maybe try a little bit of meditation beforehand, helps tremendously as well.
Oh, and also don't eat heavily before dosing. Some fruit or veggies feel perfect for me, almost always on the comedown.