All my cam gears are out of spec (run-out)!?

Since I spent so much time setting up a rig to be able to measure the end-play of the VG30 camshafts in my VG33E, I simply flipped the head around on the bench and began to measure the cam gear run-out. As it turns out, 4 out of 6 gears are out of spec; both on the RH side of the engine. How does that happen? Maybe the specs (FSM) are wrong. ??

I was also able to rig up my gauge from my cylinder bore gauge that is sensitive to .0001".

The spec says they should have less than 0.0040" run-out.

I measured:
1. USDM VG33E (LH), 150k miles: Total Run-out= 0.0029"
2. USDM VG33E (RH), 150k miles: Total Run-out= 0.0057"
3. USDM VG33E (LH), 97k miles: Total Run-out= 0.0047"
4. USDM VG33E (RH), 97k miles: Total Run-out= 0.0054"
5. JDM VG33E (LH), 65k miles: Total Run-out= 0.0037"
6. JDM VG33E (RH), 65k miles: Total Run-out= 0.0050"
7. USDM VG30E (LH), 110k miles: Total Run-out=
8. USDM VG30 (RH), 110k miles: Total Run-out=

I haven't measured the gears that came on the VG30 cams I bought.

Looks like the RH-side cam gear sees most of the abuse. The other thing is, I know the camshaft I'm bolting them to has some end-play as well, and that would likely add to the total run-out.
For example, the USDM cam gear in test number 4. above, with a total run-out of .0054", also has a total end-play in the camshaft of 0.0015". That could, technically, bring the total run-out down to about 0.0039" and just be within spec. (I thought it was odd that Nissan would suggest measuring run-out of the cam gear while bolted to a shaft that would technically have end-play that could affect the already tight specifications).

Any idea what might cause these to have so much run-out? Or, is 5-6 thousands reasonable (even though the spec says 0.004")?