Hi Scott,
It looks like you reversed the ink limits in what you wrote.
Check to make sure all ink controls and color management are turned off.
The reason I mention that is because all patches on your bottom sheet (the one you said O and G were limited to 50%) look too darn good.
It's as if you are printing the patches through a previously linearized calibration. If you read that set of patches I'll bet your curve is rather straight.
When you use CB in a straight forward "Plain Vanilla" set-up are you not happy with the results?
The writing on the charts is correct.
And, as far as I know, colour management is disabled by ColorBurst when printing the linearisation target.
In the first linearisation chart, the Ink limits for Orange and Green are both set to Zero... yet there is still colour!
In the second linearisation, the Ink Limits for Orange and Green are set to 50, to illustrate my findings.
In another, third linearisation (attached), you can see what is left if C, M and Y are set to Zero: O & G don't look quite so good without support.
Scott