I know what you are going through.
Many years ago, one of the rebuilds on the flathead in my Willys (Ford at the time, V-8), I paid to have the crank done and balanced.
Put it all together, PlastiGage was at the limits of resonableness, but it had to go together NOW (work).
Roughest, lowest oil pressure V-8 I ever had.
6 months later, I had a weekend free, yanked it out, pulled th BALANCED crank, checked bearing size, went through my "stuff" and found another crank same size journals, cleaned is and just slapped it in.
Oil pressure where it should be and SMOOTH as glass.
Went another HARD 175K before I did a Merc version in 3/4 race for it.
Morons.