Seems most of the Weatherby Vangards suffer from the same problem. I worked on one earlier this week for a buddy. With the engagement screw set so the safety still functioned, there was at least 3 distinct points of creep I could feel.
With the trigger removed from the Rifle, I then removed the trigger lever from it's housing. The contact point of this part was horrible, and it looked like some filed it crosswise or something. I clamped my HARD knife shaprening stone into the vise and set everything up under a magnifying glass so I could see exactly what I was doing every step of the way. I carefully honed away the 3 little high spots on the surface, and that is all I did. I actually honed so little as to not even change the texture of the entire engagement surface. When viewed under a magnifying glass the part looked as though it was investment cast and just came out rough.
This was a very tedious job, and unless you are competent working on Trigger leave it to a gunsmith. Either that or be prepaired to buy replacement parts and turn it over to a gunsmith in the end.
After I had things smooth I still was not able to achieve under a 4 1/2 pound trigger pull weight with the factory spring. I found some spring stock and was able to make a replacement spring that brought the pull weight down to 3 pounds. The replacement spring I made this spring out of is in a box of bulk gun springs I purchased from a gunsmith many years ago.
The end result was a really decent trigger that took 2 1/2 hours of work. If you are not totally familiar with triggers, how the operate and confident in working on them, take it to a gunsmith as I am sure the bill for tuning the trigger will be less than if you mess it up, have to buy replacement parts and ultimately end up taking it to a gunsmith to fix (been there, done that many years ago).
SD Handgunner