Don’t roast me. Only know what I was taught.

I’m a recently licensed surveyor. Got asked to bust about 25 acres off an almost 2,000-acre farm. It runs with an adjoining tract about 1,555’. The 2,000 had its northern boundary surveyed in the 80’s. I’ve ran the entire north boundary to make sure I get this right. The survey from the 80’s showed the line that I’m surveying against straight. Ran it back to the deeds before this deed, and it’s also a straight line. The original deed calls for a chestnut oak online which I found, and am using for a corner on the new division. The other end of the line calls for an iron pin at the fence post corner. I have searched and searched for the pin to no avail. In fact, I’ve only found one of the 5 called for pins. Since the survey in the 80’s, a new fence had been constructed. The survey in the 80’s shows the property line running in a straight line with the fence. The new fence is not straight, and encroaches on the neighbor by 10 feet near the middle. I was always taught by my PLS to use the field evidence and not to cause any problems that don’t exist. Every surveyor in this area does the same. I pinned the fence as it runs currently. I’m thinking of going out and pulling the pins and running it all in a straight line from the chestnut oak to the fence post corner. What would you do?