You might think about getting some repro brake pins.
The heads are a bit larger and you need to grind the outer diameter to fit, but they are longer than NOS by a little. See my website for the actual numbers. The shaft diameter is also a bit larger and may touch the side of the king pin and so you might have to grind a bit to reduce the diameter of the shaft for smooth operation.
While you are this far apart, did you put in NOS or new wedges?
I think many underestimate the wear in used wedges and this may contribute to unequal brake operation. Nothing more annoying than having the brakes applying at different rates on the same axle. The new wedges are supposed to be pretty good.
I suggest that you take time to play with the parts some before deciding they work right together. I found the interference on the pin to kingpin when I took the pin out after playing some. I could see some marks at the top and bottom where the repro pin was touching the kingpin in the hole. I know the pins shaft diameter was slightly larger than the NOS pins I used.
The last consideration is the lever arm shafts. I used NOS wedges and pins, but repro lever arm shafts. I found I had a slight variation in lever angle until the play was taken out. I would not doubt that the repro shafts have some variations given the slight taper in the shafts I measured. It all gets adjusted out in the end, but I these are just my observations for your consideration.
