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GXP cranks when installed properly have no slop regardless of shell tolerances
This is right. Crankshaft end float on GXP should not happen, because the NDS crank traps the NDS bearing against the step on the spindle. That's the whole reason why they have that annoying difference in bearing bore between DS and NDS.
gbj_tester
GXP cranks - in my experience - can only be adjusted with spacers on the NDS to pull the DS inboard. Spacers on the DS, beyond taking up any space between the shield and the crank spider*, cause the NDS arm to bind the NDS bearing.
* space, not slop, because GXP cranks when installed properly have no slop regardless of shell tolerances. The whole point of GXP is that the crank bolt is only used to attach the NDS arm to the axle, and plays no part in bearing pre-load or removal of horizontal slop.