I used a little bit of Oxi-clean in the final cooking to whiten it up. As far as sealing it I am going to wait and see just how much oil still leaches out of it. The last couple of water changes that I did to the pot still had a little bit of oil on the top of the water so I suppose that there is still some in it. As for the peroxide I have a bottle of it along with a powdered bleach to put on it if I decide that I need to do it. But I am going to wait for a while to see what happens to it.
I measured the the upper cutters on my biggest one today and they measure out at 11/2" exactly.
Didn't measure the lower ones but definately shorter. Obviously mine is not big enough for any record keeping but I did get a score sheet that they all seem to use. It's the same as for a lion or bear. Here's the link to SCI.
In my experience if you only use peroxide they will stay white but if you use any actual bleach they will yellow. I did my first couple with bleach because that is the term people used and they yellowed badly after about a year like you said. I quit using bleach because of something I read somewhere and only use peroxide now. I have never had another problem.
The record books, that are put out by Boone & Crocket and Pope & Young and where I live is Henry Kelsey they are a great way to research a state or a province for big game. This does take some time but the knowledge it gives you, can be very valuable. Not all hunters have their trophies recorded, as where I live after the Hanson Buck became the new world record typical Whitetail, we saw a flood of hunters and now that has happened, some hunters are shying away from the record books but...