Why is my white space printing yellow? i1Pro, ArgyllCMS, PrintFab Composer used

[mattbuilt1]

I am printing dye sublimation inks in an Epson T5270 using PrintFab Composer as my RIP software. My color profiles are created using @Emulator 's CAP957greys335.txt batch file to create targets. These targets are printed using PrintFab Composer with no profile and sublimated onto a polyester film. Whites are white on the no-profile sublimated target. Scanning is done with an i1Pro Rev D no-cut. The generated profile has these flags: colprof -v -qh -i D50 -o 1931_2 -S AdobeRGB1998.icc -cmt -dpp -D. Finally, I print from PrintFab Composer with the new profile selected and an intent of either Perceptual or Relative Colorimetric with visually identical results. If I choose Absolute Colorimetric the yellow effect is significantly worse. The AI answer is that this is due to whitepoint compensation so I have been trying to understand if my profile is compensating for fluorescent whiteners or optical brighteners. I ran profcheck and all 8 of my pure white patches have a low Delta E (ave 0.6). However, I don't really understand what profcheck is doing. If the culprit is OBAs or FWAs, wouldn't the error be between my .ti1 and .ti3 files, not between .ti3 and .icm? The command I ran was: profcheck -v2 -s *.ti3 *.icm. I would greatly appreciate any insight; feeling in over my head with this.