Struggling w/ GR&R on ID Spline Runout

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I have issues with R&R on ID spline runout (spline specification attached). Our gage design uses a slotted expanding collet (see attachment) to RFS locate on the minor diameter of the spline. I believe that the source of my R&R problems are due to the mismatch between the slots in the collet with the teeth of the spline.

The size of the spline teeth prevent adding an indexing feature to the collet.

Our internal gage guy tried having a gage build with a solid arbor (which also means it had to be build MMC, see second attachment). That approach also failed R&R.

I'd like to find a supplier that can provide a spiral slotted collet but have not had any luck locating one.

Any suggestions on where to find a spiral slotted collet or an alternative design concept would be greatly appreciated.
 

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