I have the ultimate suggestion for you brother: THE IMMORTALIZER
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I don't mouth to lung anymore, and I was a little disappointed that the immortalizers airflow was that small, but the first thing I thought was "wow, this is the best mouth to lung device I've ever used!"
I can easily say it had the smoothest vape flavor/texture I've had, it gives this warm flavor, and has the perfect resistance for mouth to lung inhales. I'd compare it to those oldschool cartomizers that's been drilled just a tad larger, it's not "easy" to pull the air through, but it's that nice middle-ground where you can pull slow or pretty fast if your itchin' too. I think the key to it's awesome quality vape is the ceramic base plate the coils sit above, it's hard to describe, but it's just a smooth, warm and rich vape.