Hey Woodee, you don't need to foil anything for seasoning. That stuff is expensive, so save it for when you cook. Use 3 dowels for the 4-hour seasoning. It may be too much, but you need to keep smoke rolling the whole time.
If you've spent much time on here, you know the importance of weighing wood. I'd highly recommend getting a cheap scale that will weigh ounces - it's worth its "weight" in gold.
I have weighed the hickory dowels, and came up with approximately .64 oz. per inch of dowel. So, if you need 2.5 oz. for ribs, think in inches. You'd need about 4" total of dowels. A pork butt or brisket will need 8-9" of dowels. This is a temp solution...get a scale. It makes life so much easier!
Pork baby back ribs - 2.5-3 oz
Pork butt or brisket - 5-6 oz.