Travis,
The gap between the barrel flats and water table should be about .010", a small amount more or less is not a big deal. Often times fitting barrels from one gun to another is a compromise at best. Sometimes a perfect fit is possible, other times it is not. Much hand work originally went in to these old guns so some variation is to be expected.
From where you are at I would approach it the following way. Smoke the barrel lug, hook and breech face of the barrels to see where you have contact. I agree with Roger that it looks like the lower corner of the breech face is in contact with the receiver. If that is correct, then material will need to be removed from the hook allowing the barrels to seat deeper in to the action. If you want to post pictures of your barrels after smoking them in I can offer more specific advice.
Steve