<Would using the newer Gretag ColorChecker SG chart be to ambitious to use a
reference to see how my printer profiles are performing?
Basically what I would do is read my sg chart with my lino/scan and make a lab
document in PhotoShop based on my reading from the measure app.
I would then print the custom target I just made in PS using ABS intent, then
read that print using the measure app and then compare the two.>
This will show you some limitations of your profile, but there the possibility that the Colorchecker patches are out of gamut of the printer, and therefore the delta E values could be high, even though the printer profile is perfectly valid. After entering you Lab values in Photoshop, you could then convert those Lab values to your printer profile, and then back to Lab to ensure all values are in gamut, then print, measure and calculate delta E with the current Photoshop Lab values. This will remove gamut limitations of the device from the results.
mike