Thanks to all for commenting. My choice of Cadmium Yellows is Cadmium Yellow Lemon and Cadmium yellow light or Pale. To me, Cad Lemon is the coolest of the Cadmium Yellows ( haven’t used Cad Chartruse), with each next level getting a little warmer, more orange, (light, medium, dark, orange). They all should have pigment PY35 or PY37. What makes them cooler (Lemon-greenish) or warmer (orange), is probably in the processing of pigment and processing of paint. I find you cannot get Cadmium light to have the same cool, bright tone as Cadmium Lemon. Vice versa for the warm bright highlight you get with Cad Light. If you mix a tiny amount of a neutral red in Cad Lemon you can warm it up but it may dull somewhat depending on your white and the properties of the red. I find PR254 to be fairly neutral. PR255 leaning a little to orange. M Graham makes a good Pyrrole red.
I have tried using a split primary palette. I find it more difficult to manage, but as I get more experience it may expand color relations.