"Personally, I'd gladly sacrifice a couple of ounces for better zippers on this tent."
Even the light coil zips rated around #3 vary quite a bit. The black YKK ones from Quest and other suppliers weight about an ounce per 8 feet and have a very fine coil. OK for the netting, but maybe not for the door in the outer shell which is more exposed to the elements. For the outer zips, there is a slightly heavier coil, at about 1.2 ounces per 8 feet, available from Warmlite, that is more durable.
So you may not have to add even as much as a couple ounces to get a sturdier zipper.
For serious icing, there is a #3 Delrin tooth zipper I also obtained from Warmlite sometime ago.