Totally random. And somewhat a paradox, since I bought the pipe to mellow out and be less obsessive... But, I find that some of my pipes have a quite tight draw and some of them are not tight if you can describe it that way (This is while drawing on the stem before putting in any tobacco). For example, I recently bought a peterson 303 system. The draw is very tight, but, packed properly, she smokes perfectly. Likewise I have a savinelli with a much more airy/loose draw and she smokes fine once packed properly. Reading this back, it's totally OCD, but anyway, just wondering if anyone has any thoughts!