John,
Thanks for your input as resident brickboard distributor expert.

Having carefully read the warnings re: the potential fragility and lack of availability of the fiber washers, I was extraordinarily careful not to damage or lose any of them when I took it apart.
I did have to flatten the toothed washer that covers the seal after extracting it. I also noted that there were a couple of high spots on the drive dog face that rubs against one of the metal shims. The high spots appeared to be caused by dog deformation during the first pin removal, and I noticed the telltale shine on them when I took it apart the second time. I used 800 grit wet sandpaper on a granite surface plate to polish off the spots, but I couldn't have removed more than 0.001 at the very most --- I quit when the high spots were brought down to the level of the rest of the face.

I decided to bite the bullet and press out the pin again to figure this all out, since I am just not comfortable with that much slop.
The oilite bearing is still higher than the surrounding aluminum baseplate, so the bearing did not move therefore has nothing to do with my perceived increase in clearance.

I measured all the shims and washers (except the toothed plate which I am not going to take apart again to figure out what's going on.

To review my assembly from rotor side to dog:

1. Rotor shaft with pressed on collar
2. steel shim 0.495"(12.6mm)ID x 0.976"(24.8mm)x 0.0197"(0.5mm)
3. fiber washer 0.500"(12.7mm)ID x 0.935"(23.75mm)x 0.0293"(0.75mm)
4. toothed washer
5. distributor base casting with pressed in-oilite bearing
6. steel shim 0.495"(12.6mm)ID x 0.976"(24.8mm)x 0.0075"(0.19mm)
7. fiber washer 0.500"(12.7mm)ID x 0.935"(23.75mm)x 0.0293"(0.75mm)
8. steel shim 0.495"(12.6mm)ID x 0.976"(24.8mm)x 0.0197"(0.5mm)
9. drive dog

I noted that the steel shims #2 and #8 are identical.
It appears that the fiber washers #3 and #7 were originally identical. They appear to be somewhat worn in that they are a bit egg shaped on the OD and the thickness measures differently around the washer due to varying amounts of wear over the face of the washer. You can see that the depth of the dimples varies as well.

It appears to me that the thin shim (#6) may have been the originally selected shim to adjust shaft end play. If I use the same worn fiber washers, I could replace that shim with a thicker one and take up the extra clearance.
If I substitute another 0.0197" thick metal shim for the 0.0075" shim, I will remove about 0.012" clearance and that would be about right.
Alternatively, if I can locate a source for new unworn fiber washers, that will take up some clearance as well.

SH