Andy,
First, could you point us back to the thread about bottom-end disassembly while leaving the top end intact?
With at least 0.022" play, as you've mentioned, it is really surprising that you did not find shim bits in the sump. If the shims are intact, it makes me think that either the outer race or timing-side bushing was not fully seated when you last assembled the bottom end and now it's pushed into place. That said, I think you'll probably find the shim bits somewhere down there and we all want to know where. The last time I went through this I did find the bits in the sump.
In my case, I found that the inner race was finger-loose on the crank. That loose and there is no guarantee that the friction between the inner race and the crank will be greater than forces applied to the inner race by the rollers (others may disagree, but this just seems to make sense to me). If you're buying it, the inner race can spin and wipe out the shims. I used Loctite 641 retaining compound to keep the inner race in place on the crank and so far (about 1000 miles) it seems to be working. (I am about the furthest you can be from superstitious and still looked for wood to knock.)
Please let us know what you find down there.
Richard L.